also replace the long/size_t with sal_Int32 so we have some consistency

Change-Id: I9d3099b881354af7b9f59d312e6b15b213d1e580
Reviewed-on: https://gerrit.libreoffice.org/46395Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>