[media] media: vb2: reset queued list on REQBUFS(0) call

Queued list was not reset on REQBUFS(0) call. This caused to enqueue a
freed buffer to the driver.
Reported-by: NAngela Wan <angela.j.wan@gmail.com>
Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/videobuf2-core.c

@@ -265,6 +265,7 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
 	q->num_buffers -= buffers;
 	if (!q->num_buffers)
 		q->memory = 0;
+	INIT_LIST_HEAD(&q->queued_list);
 }
 
 /**