Use the PTR_RET() macro to simplify error processing.
Signed-off-by: NThomas Meyer <thomas@m3y3r.de>
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>