media: usb: usbtv: Stop direct calls to queue num_buffers field

jira LE-3428
Rebuild_History Non-Buildable kernel-5.14.0-570.23.1.el9_6
commit-author Benjamin Gaignard <[email protected]>
commit 4545ca5

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

	Signed-off-by: Benjamin Gaignard <[email protected]>
	Reviewed-by: Andrzej Pietrasiewicz <[email protected]>
	Signed-off-by: Hans Verkuil <[email protected]>
	Signed-off-by: Mauro Carvalho Chehab <[email protected]>
(cherry picked from commit 4545ca5)
	Signed-off-by: Jonathan Maple <[email protected]>

Author: PlaidCat

drivers/media/usb/usbtv/usbtv-video.c

@@ -726,9 +726,10 @@ static int usbtv_queue_setup(struct vb2_queue *vq,
 {
 	struct usbtv *usbtv = vb2_get_drv_priv(vq);
 	unsigned size = USBTV_CHUNK * usbtv->n_chunks * 2 * sizeof(u32);
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
-	if (vq->num_buffers + *nbuffers < 2)
-		*nbuffers = 2 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 2)
+		*nbuffers = 2 - q_num_bufs;
 	if (*nplanes)
 		return sizes[0] < size ? -EINVAL : 0;
 	*nplanes = 1;