### Description
I noticed at least one regression while testing out kamailio 5.6.0: the same configuration
yields a different result after upgrading from 5.5.4. More specifically, this xlog
line/statement:
```
xlog("L_CRIT", "vn is $vn(cli_164_src_noccgr), to int is
$(vn(cli_164_src_noccgr){s.int})\n");
```
Prints the following in syslog for `$vn(cli_164_src_noccgr) = "2152157200"`:
* On 5.5.4: `vn is 2152157200, to int is 2152157200`
* On 5.6.0~rc1: `vn is 2152157200, to int is`
I've only tested this with a couple of values and it doesn't always happen, for
example for `$vn(cli_164_src_noccgr) = "2103260000"` the issue doesn't
manifest.
Only thing I could think of is 2103260000 can be represented (unsigned) by 31 bits,
whereas you need 32 bits for 2152157200? I skimmed over pv_trans.c and there weren't
any obvious commits that could take the blame, at least not to me. Perhaps this is a
compiler/glibc thing?
### Troubleshooting
#### Reproduction
Try the transformation above with various values for the pseudovariable being transformed,
I guess.
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If the issue can be reproduced, describe how it can be done.
-->
### Additional Information
```
version: kamailio 5.6.0-rc1 (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, 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_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 10.2.1
```
* **Operating System**:
```
Linux sbcprov0-stage-lhe0-cn1 5.10.0-10-amd64 #1 SMP Debian 5.10.84-1 (2021-12-08) x86_64
GNU/Linux
```
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