Changed some asserts to failure return calls since they actually can happen
Changed some asserts to failure return calls since they actually can happen

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