igt_kms: Merge condition in igt_plane_set_fb

There were two paths for fb and !fb.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: chandra konduru <chandra.konduru@intel.com>
Cc: Thomas Wood <thomas.wood@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
1 file changed