[sr-dev] [kamailio/kamailio] ERROR: imc_handle_members(): Buffer too small for member list message (#2481)

[Anthony Messina]

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### Description

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Explain what you did, what you expected to happen, and what actually happened.
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When issuing `#members` command via IMC, the following error occurs, though the member list is returned to the client:
```
ERROR: imc [imc_cmd.c:1007]: imc_handle_members(): Message-ID: '185434_mobile-rel120YmVmYzE0ZjMwNzgyYWIxOWVjYWZhNmM1MzY5ZjY1YzU'
ERROR: imc [imc_cmd.c:1012]: imc_handle_members(): Buffer too small for member list message
```

When issuing `#rooms` command via IMC, the following error occurs, though the room list is returned to the client:
```
ERROR: imc [imc_cmd.c:1070]: imc_handle_rooms(): Buffer too small for member list message
```

In case it's relevant, the clients are using TLS connections.

### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
version: kamailio 5.4.1-2.git99b2a0c066.fc32 (x86_64/linux) 09fd6a
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, 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: 09fd6a 
compiled on 00:00:00 Sep 12 2020 with gcc 10.2.1
```

* **Operating System**:

<!--
Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `uname -a`)
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```
Fedora 32 x86_64
Linux 5.8.9-200.fc32.x86_64 #1 SMP Mon Sep 14 18:28:45 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
```


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