If authentication client disconnects while it still has pending requests, don't crash (got broken in the large pointer-change commit).
If authentication client disconnects while it still has pending requests,
don't crash (got broken in the large pointer-change commit).

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot