ublk: make ublk_ctrl_stop_dev return void
This function always returns 0, so there is no need to return a value.
Signed-off-by: Yoav Cohen <yoav@nvidia.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
authored by