[sr-dev] [kamailio/kamailio] dispatcher: kamcmd dispatcher.reload kamailio seg (#846)

[Rick]

When doing a dispatcher reload with kamcmd kamailio crashes.

```
# kamailio -v
version: kamailio 5.0.0-dev6 (x86_64/freebsd) 276ccc
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, 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_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, select, kqueue.
id: 276ccc 
compiled on 17:39:46 Sep 29 2016 with clang 3.4
```

```
#0  0x00000008098d32c3 in ds_avl_destroy (node_ptr=0x809ed2b40) at dispatch.c:3046
3046			if(dest->uri.s!=NULL)
[New Thread 80286b400 (LWP 100148/<unknown>)]
(gdb) bt
#0  0x00000008098d32c3 in ds_avl_destroy (node_ptr=0x809ed2b40) at dispatch.c:3046
#1  0x00000008098d95cb in ds_destroy_list () at dispatch.c:1000
#2  0x0000000809911ead in destroy () at dispatcher.c:593
#3  0x0000000000508345 in destroy_modules () at sr_module.c:811
#4  0x0000000000517ff7 in cleanup (show_status=1) at main.c:526
#5  0x000000000052011c in shutdown_children (sig=15, show_status=1) at main.c:668
#6  0x000000000051f094 in handle_sigs () at main.c:760
#7  0x0000000000530859 in main_loop () at main.c:1748
#8  0x000000000053b530 in main (argc=15, argv=0x7fffffffeb38) at main.c:2632
Current language:  auto; currently minimal
```

```
Nov  3 10:10:17 <local0.info> kamailio[43234]: INFO: <core> [main.c:811]: sig_usr(): signal 15 received
Nov  3 10:10:17 <local0.info> kamailio[43233]: INFO: <core> [main.c:811]: sig_usr(): signal 15 received
Nov  3 10:10:17 <local0.info> kamailio[43232]: INFO: <core> [main.c:811]: sig_usr(): signal 15 received
Nov  3 10:10:17 <local0.info> kamailio[43231]: INFO: <core> [main.c:811]: sig_usr(): signal 15 received
Nov  3 10:10:17 <local0.info> kamailio[43230]: INFO: <core> [main.c:811]: sig_usr(): signal 15 received
Nov  3 10:10:17 <local0.info> kamailio[43228]: INFO: <core> [main.c:811]: sig_usr(): signal 15 received
Nov  3 10:10:17 <local0.info> kamailio[43227]: INFO: <core> [main.c:811]: sig_usr(): signal 15 received
Nov  3 10:10:17 <local0.info> kamailio[43226]: INFO: <core> [main.c:811]: sig_usr(): signal 15 received
Nov  3 10:10:17 <local0.info> kamailio[43225]: INFO: <core> [main.c:811]: sig_usr(): signal 15 received
Nov  3 10:10:17 <local0.info> kamailio[43224]: INFO: <core> [main.c:811]: sig_usr(): signal 15 received
Nov  3 10:10:17 <local0.info> kamailio[43229]: INFO: <core> [main.c:811]: sig_usr(): signal 15 received
Nov  3 10:10:17 <local0.alert> kamailio[43223]: ALERT: <core> [main.c:738]: handle_sigs(): child process 43233 exited normally, status=0
Nov  3 10:10:17 <local0.alert> kamailio[43223]: ALERT: <core> [main.c:738]: handle_sigs(): child process 43234 exited normally, status=0
Nov  3 10:10:17 <local0.alert> kamailio[43223]: ALERT: <core> [main.c:738]: handle_sigs(): child process 43232 exited normally, status=0
Nov  3 10:10:17 <local0.alert> kamailio[43223]: ALERT: <core> [main.c:738]: handle_sigs(): child process 43231 exited normally, status=0
Nov  3 10:10:17 <local0.alert> kamailio[43223]: ALERT: <core> [main.c:738]: handle_sigs(): child process 43230 exited normally, status=0
Nov  3 10:10:17 <local0.alert> kamailio[43223]: ALERT: <core> [main.c:738]: handle_sigs(): child process 43229 exited normally, status=0
Nov  3 10:10:17 <local0.alert> kamailio[43223]: ALERT: <core> [main.c:738]: handle_sigs(): child process 43228 exited normally, status=0
Nov  3 10:10:17 <local0.alert> kamailio[43223]: ALERT: <core> [main.c:738]: handle_sigs(): child process 43227 exited normally, status=0
Nov  3 10:10:17 <local0.alert> kamailio[43223]: ALERT: <core> [main.c:738]: handle_sigs(): child process 43226 exited normally, status=0
Nov  3 10:10:17 <local0.alert> kamailio[43223]: ALERT: <core> [main.c:738]: handle_sigs(): child process 43225 exited normally, status=0
Nov  3 10:10:17 <local0.alert> kamailio[43223]: ALERT: <core> [main.c:738]: handle_sigs(): child process 43224 exited normally, status=0
Nov  3 10:10:17 <local0.info> kamailio[43223]: INFO: <core> [main.c:756]: handle_sigs(): terminating due to SIGCHLD
```

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