### Description

<!-- After installing the latest update of Kamailio 5.3 and Kamailio 5.2 the pdb module stops working -->

### Troubleshooting

#### Reproduction

<!-- After creating a mmap file and query it with pdbt you get the correct prefix. A query with Kamailio results in a wrong prefix. It seems like pdb.c returns pointer positions instead of pointer values -->

#### Debugging Data

### Possible Solutions

<!-- Reverting commit 86ebb4e of #2298 -->

### Additional Information

``` version: kamailio 5.3.4 (x86_64/linux) a35a2f-dirty 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_BLACKLIST, HAVE_RESOLV_RES 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: a35a2f -dirty compiled with gcc 4.9.2 ```

* **Operating System**:

``` Debian GNU/Linux 8 Linux voip-lab-proxy02 3.16.0-4-amd64 #1 SMP Debian 3.16.43-2+deb8u5 (2017-09-19) x86_64 GNU/Linux ```