### Description
I would like to use `http_async_query` and after enabling the module, I notice
Kamailio's main process crashes on exit or restart. I have searched and find a number
of tickets regarding http_async and crashes, but none related to exit/restart.
### Troubleshooting
```
# coredumpctl info 410246
PID: 410246 (kamailio)
UID: 985 (kamailio)
GID: 983 (kamailio)
Signal: 11 (SEGV)
Timestamp: Mon 2021-02-01 00:28:29 CST (11h ago)
Command Line: /usr/sbin/kamailio -DD --loadmodule=systemdops.so -m 128 -M 8
Executable: /usr/sbin/kamailio
Control Group: /system.slice/kamailio.service
Unit: kamailio.service
Slice: system.slice
Boot ID: 88a3838cfde647a29b3bd62f1e294ce2
Machine ID: e71248e5a94b42069b4603dde95c99b4
Storage:
/var/lib/systemd/coredump/core.kamailio.985.88a3838cfde647a29b3bd62f1e294ce2.410246.1612160909000000.zst
Message: Process 410246 (kamailio) of user 985 dumped core.
Stack trace of thread 410246:
#0 0x00007fd57d84383a BN_clear_free (libcrypto.so.1.1 + 0xb183a)
#1 0x00007fd573f9d275 ssh_dh_finalize.part.0 (libssh.so.4 + 0x1e275)
#2 0x00007fd573f8ec40 libssh_destructor (libssh.so.4 + 0xfc40)
#3 0x00007fd57ead8cd3 _dl_fini (ld-linux-x86-64.so.2 + 0x10cd3)
#4 0x00007fd57e7a4237 __run_exit_handlers (libc.so.6 + 0x40237)
#5 0x00007fd57e7a43e0 exit (libc.so.6 + 0x403e0)
#6 0x000000000041f61a handle_sigs (kamailio + 0x1f61a)
#7 0x000000000042c61c main_loop (kamailio + 0x2c61c)
#8 0x0000000000434cbd main (kamailio + 0x34cbd)
#9 0x00007fd57e78c1e2 __libc_start_main (libc.so.6 + 0x281e2)
#10 0x000000000041bbde _start (kamailio + 0x1bbde)
```
#### Reproduction
This happens at every kamailio shutdown.
#### Debugging Data
<!--
If you got a core dump, use gdb to extract troubleshooting data - full backtrace,
local variables and the list of the code at the issue location.
gdb /path/to/kamailio /path/to/corefile
bt full
info locals
list
If you are familiar with gdb, feel free to attach more of what you consider to
be relevant.
-->
[
gdb.txt](https://github.com/kamailio/kamailio/files/5905920/gdb.txt)
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.4.3-5.git06bd17a838.fc33.2 (x86_64/linux) e19ae3
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: e19ae3
compiled on 00:00:00 Jan 24 2021 with gcc 10.2.1
```
* **Operating System**:
```
Linux 5.10.10-200.fc33.x86_64 #1 SMP Sun Jan 24 19:58:54 UTC 2021 x86_64 x86_64 x86_64
GNU/Linux
```
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