Don't crash if dotlock replacing failed.
Don't crash if dotlock replacing failed.

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