and avoid some reference-counting in a hot path

Change-Id: I7f5fd7f8f5f9076eb5f8d60118afa8e3ac8a5e6c
Reviewed-on: https://gerrit.libreoffice.org/38129Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>