[LBBS-125] net_imap: SEGV if client login fails

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This has been seen a couple times now, and no, this is not a false positive as in [LBBS-118]:

[2025-10-09 19:13:39.859]   DEBUG[427336]: mod_mail.c:236 mailbox_dispatch_event: Dispatching mailbox event 'Logout' (maildir: )
[2025-10-09 19:13:39.859]   DEBUG[427336]: imap_client.c:93 client_destroy: Destroying IMAP client
Segmentation fault (core dumped)

Thread 1 (Thread 0x7f07467d46c0 (LWP 427336)):
#0  client_destroy (client=0x7f07782486f0) at imap_client.c:94
        __func__ = "client_destroy"
#1  0x00007f07682b3837 in imap_shutdown_clients (imap=0x7f07467d3840) at imap_client.c:133
        __list_head = 0x7f07467d3b98
        __list_current = 0x7f07782486f0
        __func__ = "imap_shutdown_clients"
#2  0x00007f07682e0070 in imap_destroy (imap=0x7f07467d3840) at net_imap.c:835
        __func__ = "imap_destroy"
#3  0x00007f0768309ce6 in imap_handler (node=0x7f0778006170, secure=1) at net_imap.c:5107

[2025-10-15 01:49:55.856]   DEBUG[535166]: mod_curl.c:238 curl_common_run: CURL Response Code: 200 - 2064 bytes (https://login.microsoftonline.com/common/oauth2/v2.0/token)
[2025-10-15 01:49:55.859]   DEBUG[535166]: mod_oauth.c:214 refresh_token: OAuth refresh token has changed
[2025-10-15 01:49:55.860]   DEBUG[535166]: config.c:375 config_parse_or_write: Parsing config /home/bbs/files/home/1/.config/.oauth.conf
[2025-10-15 01:49:55.860]   DEBUG[535166]: config.c:502 config_parse_or_write: Updating setting 'refreshtoken' in existing config
[2025-10-15 01:49:55.860]   DEBUG[535166]: config.c:551 config_parse_or_write: Parsed config /home/bbs/files/home/1/.config/.oauth.conf
[2025-10-15 01:49:55.860]   -- Refreshed OAuth token 'hotmail' (good for 3599s)
[2025-10-15 01:49:58.003]   DEBUG[532379]: net_imap.c:4346 handle_idle: Received during IDLE: * 104692 FETCH (UID 120997 FLAGS (encrypted))
[2025-10-15 01:49:58.503]   DEBUG[532379]: readline.c:173 bbs_readline: bbs_poll_read returned 0
[2025-10-15 01:50:05.871]   DEBUG[535166]: readline.c:173 bbs_readline: bbs_poll_read returned 0
[2025-10-15 01:50:05.871] WARNING[535166]: mod_mail.c:2020 imap_client_login: No response from IMAP server outlook.office365.com:993?
[2025-10-15 01:50:05.871]   DEBUG[535168]: io.c:358 io_thread: poll(pfds[1]) returned POLLHUP (fd 92)
[2025-10-15 01:50:05.871]   DEBUG[535168]: io.c:368 io_thread: TLS I/O thread exiting
[2025-10-15 01:50:05.871]   DEBUG[535168]: thread.c:155 __thread_unregister: Thread 535168 is exiting (must be joined)
[2025-10-15 01:50:05.871]   DEBUG[535166]: thread.c:150 __thread_unregister: Thread 535168 has been joined by thread 535166 at io.c:592 teardown_transformation()
[2025-10-15 01:50:06.842]   DEBUG[535166]: io_tls.c:590 ssl_close: Bidirectional SSL shutdown failed 0x7efc6c783e40: SSL_ERROR_SSL
[2025-10-15 01:50:06.844]   DEBUG[535166]: imap_client.c:1226 imap_proxy_remote_mailbox_exclusively: No such remotely mapped mailbox 'Other Users.3hotmail'
[2025-10-15 01:50:06.844]   DEBUG[535166]: net_imap.c:3849 finish_auth: 0x7efc627fb840 <= 1 NO [NONEXISTENT] No such remotely mapped mailbox '3hotmail'
Segmentation fault (core dumped)

Thread 1 (Thread 0x7efc627fc6c0 (LWP 535166)):
#0  client_destroy (client=0x7efc6c0f2b40) at imap_client.c:94
        __func__ = "client_destroy"
#1  0x00007efc6879d837 in imap_shutdown_clients (imap=0x7efc627fb840) at imap_client.c:133
        __list_head = 0x7efc627fbb98
        __list_current = 0x7efc6c0f2b40
        __func__ = "imap_shutdown_clients"
#2  0x00007efc687ca070 in imap_destroy (imap=0x7efc627fb840) at net_imap.c:835
        __func__ = "imap_destroy"
#3  0x00007efc687f3ce6 in imap_handler (node=0x7efc80024760, secure=1) at net_imap.c:5107

(gdb) print *client
$1 = {name = 0x7efc6c783e30 "", virtprefix = 0x7efc6c000090 "\220\227\255l\374~", imap = 0x0...

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