which is often a useful indicator that the callers can be made to use
std::unique_ptr

Change-Id: Idb1745d1f58dbcf389c9f60f1a5728d7d092ade5
Reviewed-on: https://gerrit.libreoffice.org/56238
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>