and remove some manual ref counting

Change-Id: Ib78122fbbf914e87e0aef1f8fffe3952639e5b22
Reviewed-on: https://gerrit.libreoffice.org/38607Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>