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### Description
It seems that the fixup_free_* functions are not getting called when used with:
```
static cmd_export_t cmds[] = {
{"acc_log_request", (cmd_function)w_acc_log_request, 1,
acc_fixup, free_acc_fixup,
ANY_ROUTE},
// ...
{0, 0, 0, 0, 0, 0}
};
static int free_acc_fixup(void **param, int param_no)
{
LM_CRIT("acc free fixup = %d\n", param_no);
if(*param) {
pkg_free(*param);
*param = 0;
}
return 0;
}
```
Nothing is getting logged from the function. Is this expected not to print in
free_fixup due to the destruction of kamailio and the logging is not reliable?
I also used gdb and added some breakpoints in `fixup` and `free_fixup`
functions in some other modules (file_out) and the breakpoint was only found in
`fixup` but not in `free_fixup`.
When is the `free_fixup` supposed to be called, at kamailio destruction or
after fixing it and before the main loop starts?
<!--
Explain what you did, what you expected to happen, and what actually happened.
-->
### Troubleshooting
#### Reproduction
<!--
If the issue can be reproduced, describe how it can be done.
-->
Use any module that has a custom (maybe also provided from core) `free_fixup`
function, and monitor if `free_fixup` is called using debug mode.
#### Log Messages
<!--
Check the syslog file and if there are relevant log messages printed by
Kamailio, add them next, or attach to issue, or provide a link to download them
(e.g., to a pastebin site).
-->
```
Apr 15 15:52:03 app01 kamailio[812169]: INFO: <core> [core/mem/q_malloc.c:402]:
qm_malloc(): qm_malloc(0x7fcdcab18010, 56) called from file_out: file_out.c:
fo_fixup_str_index(287)
Apr 15 15:52:03 app01 kamailio[812169]: INFO: <core> [core/mem/q_malloc.c:449]:
qm_malloc(): qm_malloc(0x7fcdcab18010, 64) returns address 0x7fcdcacc4280 frag.
0x7fcdcacc4240 (size=64) on 1 -th hit```
`0x7fcdcacc4240` fragment is not found anywhere in the logs reported that it
was freed unlike other malloced resources.
```
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.9.0-dev0 (x86_64/linux) 8bc64a
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE,
USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, Q_MALLOC,
F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT,
USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES,
TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_SEND_BUFFER_SIZE
262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: 8bc64a
compiled on 15:32:09 Apr 15 2024 with gcc 10.5.0
```
* **Operating System**:
<!--
Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu
16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `lsb_release -a` and `uname -a`)
-->
```
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.6 LTS
Release: 20.04
Codename: focal
5.4.0-176-generic #196-Ubuntu SMP Fri Mar 22 16:46:39 UTC 2024 x86_64 x86_64
x86_64 GNU/Linux
```
--
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