[sr-dev] [kamailio/kamailio] format-truncation warning (Issue #3013)

[sergey-safarov]

**1**
```
CC (gcc) [M presence.so]		notify.o
CC (gcc) [M presence.so]		presence.o
presence.c: In function 'child_init':
presence.c:570:62: warning: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size 3 [-Wformat-truncation=]
  570 |                         snprintf(tmp, 21, "PRESENCE NOTIFIER %d", i);
      |                                                              ^~
presence.c:570:43: note: directive argument in the range [-2147483647, 2147483646]
  570 |                         snprintf(tmp, 21, "PRESENCE NOTIFIER %d", i);
      |                                           ^~~~~~~~~~~~~~~~~~~~~~
presence.c:570:25: note: 'snprintf' output between 20 and 30 bytes into a destination of size 21
  570 |                         snprintf(tmp, 21, "PRESENCE NOTIFIER %d", i);
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
CC (gcc) [M presence.so]		presence_dmq.o
CC (gcc) [M presence.so]		presentity.o
CC (gcc) [M presence.so]		publish.o
CC (gcc) [M presence.so]		subscribe.o
CC (gcc) [M presence.so]		utils_func.o
```
**2**
```
CC (gcc) [M rls.so]		resource_notify.o
CC (gcc) [M rls.so]		rls.o
rls.c: In function 'child_init':
rls.c:688:57: warning: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size 3 [-Wformat-truncation=]
  688 |                         snprintf(tmp, 16, "RLS NOTIFIER %d", i);
      |                                                         ^~
rls.c:688:43: note: directive argument in the range [-2147483647, 2147483646]
  688 |                         snprintf(tmp, 16, "RLS NOTIFIER %d", i);
      |                                           ^~~~~~~~~~~~~~~~~
rls.c:688:25: note: 'snprintf' output between 15 and 25 bytes into a destination of size 16
  688 |                         snprintf(tmp, 16, "RLS NOTIFIER %d", i);
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
CC (gcc) [M rls.so]		rls_db.o
CC (gcc) [M rls.so]		subscribe.o
CC (gcc) [M rls.so]		utils.o
```


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