lib-index: Detect broken log_file_tail_offset updates without assert-crashing.
lib-index: Detect broken log_file_tail_offset updates without assert-crashing.

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