coverity#708535 Uninitialized scalar field

Change-Id: Ife2acd5dd5193edd0ca34d85370885ee6865fadd
(cherry picked from commit ecc6239f5b7decfc61b68e745175982fdeee931e)
Reviewed-on: https://gerrit.libreoffice.org/8512
Reviewed-by: Tor Lillqvist <tml@collabora.com>
Tested-by: Tor Lillqvist <tml@collabora.com>