[LBBS-81] io_tls: Crash due to uninitialized memory

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[2024-11-21 12:20:30.439]   DEBUG[1395492]: imap_client.c:507 __imap_client_send_log: 0x7fe4b405f180 => 53 UID FETCH 185745,185697,185563,185467,185350,185338,185332,185327,185324,185270 (UID INTERNALDATE FLAGS BODY.PEEK[])
[2024-11-21 12:20:30.472]   DEBUG[1395492]: imap_client.c:507 __imap_client_send_log: 0x7fe484025730 => 53 APPEND "REDACTED" (\Seen) "19-Nov-2024 00:37:48 -0500" {11484+}
[2024-11-21 12:20:31.255]   DEBUG[1350221]: socket.c:2315 timed_write: File descriptor 217 did not become writable after 750 ms
[2024-11-21 12:20:31.255] WARNING[1350221]: socket.c:2499 bbs_timed_write: Wanted to write 8192 bytes to fd 217, only wrote 4096
[2024-11-21 12:20:31.255]   DEBUG[1350221]: io_tls.c:626 ssl_io_thread: Wanted to write 8192 bytes but wrote 4096
[2024-11-21 12:20:31.255]   DEBUG[1350221]: io_tls.c:645 ssl_io_thread: Deferred write of 4096 bytes from session 0x7fe4b401eaa0
[2024-11-21 12:20:31.355]   DEBUG[1350221]: socket.c:2315 timed_write: File descriptor 217 did not become writable after 100 ms
[2024-11-21 12:20:31.356]   DEBUG[1350221]: io_tls.c:499 ssl_io_thread: Deferred write of 4096 bytes couldn't yet be serviced
[2024-11-21 12:20:31.356] WARNING[1350221]: io_tls.c:482 ssl_io_thread: Discarding deferred write of 3458764513820540969 bytes, associated TLS session 0x100000001000 no longer exists

Thread 1 (Thread 0x7fe4c3b836c0 (LWP 1350221)):
#0  0x00007fe4c4ce9acb in ssl_io_thread (unused=unused@entry=0x0) at io_tls.c:472
        __list_head = 0x7fe4c4cee3e0 <deferred_writes>
        __list_next = Python Exception <class 'gdb.MemoryError'>: Cannot access memory at address 0x200000022
#1  0x00005637a13d5a39 in thread_run (data=<optimized out>) at thread.c:411

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