...following up on 1453c2c8 "prefer vector::data
to &vector[0]"

Change-Id: I7c113747d92d144a521d49b89384dd8bf1215c01
Reviewed-on: https://gerrit.libreoffice.org/72765
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>