### Description
Calling functions from the `dialplan` module in 5.8 (`dp_translate()`,
`dp_match()`) results in the following line being logged:
```
WARNING: <core> [core/mem/q_malloc.c:520]: qm_free(): WARNING: free(0) called
from dialplan: dp_db.c: pcre2_free(206)
```
Is this a functional problem, or just a case of overly aggressive logging?
### Troubleshooting
#### Reproduction
Reproducible with the following kamailio config:
```
#!KAMAILIO
loadmodule "pv"
loadmodule "db_sqlite"
loadmodule "xlog"
loadmodule "dialplan"
disable_tcp = true
force_rport = true
!!define DBFILE /etc/kamailio/kamailio.sqlite
modparamx("db_sqlite","db_set_readonly", "$def(DBFILE)")
modparamx("dialplan","db_url", "sqlite:///$def(DBFILE)")
modparam("dialplan", "attrs_pvar", "$avp(dp_attrs)")
request_route {
if ( $rm == "ACK" ) {
exit;
}
xinfo("$ci New request\n");
dp_match("1", "$rU");
exit;
}
```
The warning log is issued in 5.8 but not 5.7. Reproduced by sending a request
with SIPp:
```
sipp -sn uac -m 1 -s 15554445555 localhost
```
### Possible Solutions
Not sure if this is just a case of logging being overly aggressive, or an issue
with the module's memory management.
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.8.1 (x86_64/linux)
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: unknown
compiled with gcc 12.2.0
```
Tested using docker `debian:12-slim` using the official packages from
`http://deb.kamailio.org/kamailio58`
* **Operating System**:
Docker debian:12-slim, but also observed in Alpine Linux/
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https://github.com/kamailio/kamailio/issues/3851
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