rpki-client: recallocarray conversions

[Theo Buehler]

As discussed a few days ago, there are a few reallocarray + memset that
can be directly handled by recallocarray.

Index: main.c
===================================================================
RCS file: /cvs/src/usr.sbin/rpki-client/main.c,v
retrieving revision 1.101
diff -u -p -r1.101 main.c
--- main.c      18 Feb 2021 10:10:20 -0000      1.101
+++ main.c      19 Feb 2021 08:56:19 -0000
@@ -265,12 +265,12 @@ repo_alloc(void)
 {
        struct repo *rp;
 
-       rt.repos = reallocarray(rt.repos, rt.reposz + 1, sizeof(struct repo));
+       rt.repos = recallocarray(rt.repos, rt.reposz, rt.reposz + 1,
+           sizeof(struct repo));
        if (rt.repos == NULL)
-               err(1, "reallocarray");
+               err(1, "recallocarray");
 
        rp = &rt.repos[rt.reposz++];
-       memset(rp, 0, sizeof(struct repo));
        rp->id = rt.reposz - 1;
 
        return rp;
Index: mft.c
===================================================================
RCS file: /cvs/src/usr.sbin/rpki-client/mft.c,v
retrieving revision 1.26
diff -u -p -r1.26 mft.c
--- mft.c       16 Feb 2021 07:58:30 -0000      1.26
+++ mft.c       19 Feb 2021 07:04:25 -0000
@@ -193,13 +193,12 @@ mft_parse_filehash(struct parse *p, cons
 
        /* Insert the filename and hash value. */
 
-       p->res->files = reallocarray(p->res->files, p->res->filesz + 1,
-           sizeof(struct mftfile));
+       p->res->files = recallocarray(p->res->files, p->res->filesz,
+           p->res->filesz + 1, sizeof(struct mftfile));
        if (p->res->files == NULL)
                err(1, NULL);
 
        fent = &p->res->files[p->res->filesz++];
-       memset(fent, 0, sizeof(struct mftfile));
 
        fent->file = fn;
        fn = NULL;
Index: roa.c
===================================================================
RCS file: /cvs/src/usr.sbin/rpki-client/roa.c,v
retrieving revision 1.14
diff -u -p -r1.14 roa.c
--- roa.c       16 Feb 2021 07:58:30 -0000      1.14
+++ roa.c       19 Feb 2021 07:07:30 -0000
@@ -111,12 +111,11 @@ roa_parse_addr(const ASN1_OCTET_STRING *
                /* FIXME: maximum check. */
        }
 
-       p->res->ips = reallocarray(p->res->ips,
-               p->res->ipsz + 1, sizeof(struct roa_ip));
+       p->res->ips = recallocarray(p->res->ips, p->res->ipsz, p->res->ipsz + 1,
+           sizeof(struct roa_ip));
        if (p->res->ips == NULL)
                err(1, NULL);
        res = &p->res->ips[p->res->ipsz++];
-       memset(res, 0, sizeof(struct roa_ip));
 
        res->addr = addr;
        res->afi = afi;