Also cleaning up bUseBufferedStream parameter.

Change-Id: Ibf9c9fcefbdcd229ffaa1d3b169ff87f00e91ceb
Reviewed-on: https://gerrit.libreoffice.org/38661Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>