exactly one use site

Change-Id: Id0a75d46c459be213e81b47aa6c1194c87aec848
Reviewed-on: https://gerrit.libreoffice.org/42891Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>