coverity#708535 Uninitialized scalar field

Change-Id: Ife2acd5dd5193edd0ca34d85370885ee6865fadd
(cherry picked from commit ecc6239f5b7decfc61b68e745175982fdeee931e)
Reviewed-on: https://gerrit.libreoffice.org/8513
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>