and fix leak in RemoveImage in the process

Change-Id: I20e395178f92f7127e99011aebbe97246f255d1d
Reviewed-on: https://gerrit.libreoffice.org/51550Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>