mdbox: Replaced non-error-checking i_stream_stat() with potentially faster i_stream_get_size().
mdbox: Replaced non-error-checking i_stream_stat() with potentially faster i_stream_get_size().

jwm/dovecot-notmuch,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot,jkerihuel/dovecot,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot,jwm/dovecot-notmuch,jwm/dovecot-notmuch