Since kthread_run returns -ENOMEM if failed,
it needs to be checked whether it is error, not whether it is null.
Signed-off-by: NInsu Yun <wuninsu@gmail.com>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>