coverity#1255909 Uninitialized scalar field

Change-Id: I162199233c9d3feb03e7ab33b777174b2a03035a
Reviewed-on: https://gerrit.libreoffice.org/13104
Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>