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### Description

<!--
Explain what you did, what you expected to happen, and what actually happened.
-->
I tried to configure the carrierroute module with the description loaded from 
the database into an avp. But it crashes with a segfault while startup.

### Troubleshooting

#### Reproduction

<!--
If the issue can be reproduced, describe how it can be done.
-->

```
/* ----- carrierroute params ----------------------------------------------- */
modparam("carrierroute", "config_source", "db")
modparam("carrierroute", "db_url", ....)
modparam("carrierroute", "fetch_rows", 2000)
modparam("carrierroute", "db_load_description", 1)
modparam("carrierroute", "match_mode", 10)
modparam("carrierroute", "avoid_failed_destinations", 1)
```

```
if (cr_route("default", "default", "$(rU{s.strip,1})", "$rU", "call_id", 
"destination")) {
    ....
}
```

#### Debugging Data

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If you got a core dump, use gdb to extract troubleshooting data - full 
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  gdb /path/to/kamailio /path/to/corefile
  bt full
  info locals
  list

If you are familiar with gdb, feel free to attach more of what you consider to
be relevant.
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```
#0  avp_name_fixup (param=0x8018d1330) at cr_fixup.c:187
187             if (((gparam_p)(*param))->v.pve->spec->type == PVT_AVP &&
[New Thread 80165a600 (LWP 100186/<unknown>)]
(gdb) bt full
#0  avp_name_fixup (param=0x8018d1330) at cr_fixup.c:187
No locals.
#1  0x00000008072f0256 in cr_route_fixup (param=0x8018d1330, param_no=6) at 
cr_fixup.c:242
        my_hash_source = shs_call_id
#2  0x000000000073238e in fix_actions (a=0x8018d1258) at core/route.c:919
        t = (struct action *) 0x8018d1258
        p = (struct proxy_l *) 0xffffffff00000048
        tmp = 0x0
        tmp_p = (void *) 0x8018d1660
        ret = 0
        i = 5
        cmd = (sr31_cmd_export_t *) 0x80186dcd0
        s = {s = 0xffffffff00000000 <Address 0xffffffff00000000 out of bounds>, 
len = 0}
        he = (struct hostent *) 0x4
        ip = {af = 4859304, len = 0, u = {addrl = 0x7fffffff9be0, addr32 = 
0x7fffffff9be0, addr16 = 0x7fffffff9be0, addr = 0x7fffffff9be0 "?"}}
        si = (struct socket_info *) 0x7fffffff9c10
        lval = (struct lvalue *) 0xffffffff00000001
        rve = (struct rval_expr *) 0x0
        err_rve = (struct rval_expr *) 0x1
        rve_type = RV_NONE
        err_type = 48625432
        expected_type = RV_NONE
        rv = (struct rvalue *) 0x9b6cf7
        rve_param_no = 0
#3  0x000000000068a1c4 in fix_rval (rv=0x8018d36c8, rve=0x8018d36c0) at 
core/rvalue.c:2873
No locals.
#4  0x000000000068843e in fix_rval_expr (p=0x8018d36c0) at core/rvalue.c:3797
        rve = (struct rval_expr *) 0x8018d36c0
        ret = 32767
#5  0x000000000072aa08 in fix_actions (a=0x8018c94d0) at core/route.c:706
        t = (struct action *) 0x8018d1d18
        p = (struct proxy_l *) 0x68341cdd25
        tmp = 0x3 <Address 0x3 out of bounds>
        tmp_p = (void *) 0x8018cc9c0
        ret = 0
        i = 1
        cmd = (sr31_cmd_export_t *) 0x801869de0
        s = {s = 0x8018cc9c0 "", len = 5}
        he = (struct hostent *) 0x9b6cf7
        ip = {af = 6302080, len = 0, u = {addrl = 0x7fffffffcfc0, addr32 = 
0x7fffffffcfc0, addr16 = 0x7fffffffcfc0, addr = 0x7fffffffcfc0 ""}}
        si = (struct socket_info *) 0x7fffffffd0a0
        lval = (struct lvalue *) 0x800f42023
        rve = (struct rval_expr *) 0x8018d36c0
        err_rve = (struct rval_expr *) 0x0
        rve_type = RV_INT
        err_type = 9938251
        expected_type = 32767
        rv = (struct rvalue *) 0x8018ccf20
        rve_param_no = 0
#6  0x000000000073fd6d in fix_rl (rt=0xce3830) at core/route.c:2088
        i = 0
        ret = -12096
#7  0x000000000073fc37 in fix_rls () at core/route.c:2104
        ret = 4
#8  0x000000000043b0ae in main (argc=4, argv=0x7fffffffeb30) at main.c:2635
        cfg_stream = (FILE *) 0x8011fdc90
        c = -1
        r = 1
        tmp = 0x800f84aa2 "H\213\vH;M?u\aH\203?([]??\225!??f\017\037\204"
        tmp_len = 32767
        port = -5424
        proto = 0
        options = 0x979297 
":f:cm:M:dVIhEeb:l:L:n:vKrRDTN:W:w:t:u:g:P:G:SQ:O:a:A:x:X:Y:"
        ret = -1
        seed = 2763663412
        rfd = 4
        debug_save = 3
        debug_flag = 1
        dont_fork_cnt = 1
        n_lst = (struct name_lst *) 0x7fffffffeaa0
        p = 0x4 <Address 0x4 out of bounds>
        st = {st_dev = 93, st_ino = 160517, st_mode = 16832, st_nlink = 2, 
st_uid = 986, st_gid = 986, st_rdev = 332063, st_atim = {tv_sec = 1459764184, 
tv_nsec = 513386000}, 
  st_mtim = {tv_sec = 1502352532, tv_nsec = 990638000}, st_ctim = {tv_sec = 
1502352532, tv_nsec = 990638000}, st_size = 512, st_blocks = 8, st_blksize = 
32768, st_flags = 0, 
  st_gen = 3958570559, st_lspare = 0, st_birthtim = {tv_sec = 1459764184, 
tv_nsec = 513356000}}
Current language:  auto; currently minimal
```

#### Log Messages

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Kamailio, add them next, or attach to issue, or provide a link to download them 
(e.g., to a pastebin site).
-->

```
 0(45720) DEBUG: <core> [core/route.c:872]: fix_actions(): fixing cr_route()
 0(45720) DEBUG: <core> [core/pvapi.c:419]: pv_spec_lookup(): PV 
<$(rU{s.strip,1})> is not in cache
 0(45720) DEBUG: <core> [core/pvapi.c:293]: pv_cache_add(): pvar 
[$(rU{s.strip,1})] added in cache
 0(45720) DEBUG: <core> [core/pvapi.c:321]: pv_cache_lookup(): pvar [$rU] found 
in cache
Segmentation fault (core dumped)
```

#### SIP Traffic

<!--
If the issue is exposed by processing specific SIP messages, grab them with 
ngrep or save in a pcap file, then add them next, or attach to issue, or 
provide a link to download them (e.g., to a pastebin site).
-->

```
none
```

### Possible Solutions

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If you found a solution or workaround for the issue, describe it. Ideally, 
provide a pull request with a fix.
-->

### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
# kamailio -v
version: kamailio 5.1.0-dev5 (x86_64/freebsd) 
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, 
USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, 
TLSF_MALLOC, DBG_SR_MEMORY, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, 
USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, 
MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, select, kqueue.
id: unknown 
compiled on 16:54:24 Aug  9 2017 with clang 3.8
```

* **Operating System**:

<!--
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16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `uname -a`)
-->

```
# uname -a
FreeBSD hostname.com 11.0-RELEASE-p9 FreeBSD 11.0-RELEASE-p9 #0: Tue Apr 11 
08:48:40 UTC 2017     
r...@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64
```


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