When data stack grew larger than two blocks, t_pop()ing crashed when trying to free extra blocks.
When data stack grew larger than two blocks, t_pop()ing crashed when trying
to free extra blocks.

Distrotech/dovecot,damoxc/dovecot,LTD-Beget/dovecot,Distrotech/dovecot,LTD-Beget/dovecot,Distrotech/dovecot,Distrotech/dovecot,damoxc/dovecot,Distrotech/dovecot,LTD-Beget/dovecot,damoxc/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,damoxc/dovecot,damoxc/dovecot