fixes a leak in the KeyList too

Change-Id: I603218ff99481bc006df329c770ea6fe6f147483
Reviewed-on: https://gerrit.libreoffice.org/68694Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>