media: saa7146: constify videobuf_queue_ops structures

videobuf_queue_ops are not supposed to change at runtime. All functions
working with videobuf_queue_ops provided by <media/videobuf-core.h> work
with const videobuf_queue_ops. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/common/saa7146/saa7146_vbi.c

@@ -308,7 +308,7 @@ static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 	saa7146_dma_free(dev,q,buf);
 }
 
-static struct videobuf_queue_ops vbi_qops = {
+static const struct videobuf_queue_ops vbi_qops = {
 	.buf_setup    = buffer_setup,
 	.buf_prepare  = buffer_prepare,
 	.buf_queue    = buffer_queue,

drivers/media/common/saa7146/saa7146_video.c

@@ -1187,7 +1187,7 @@ static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 	release_all_pagetables(dev, buf);
 }
 
-static struct videobuf_queue_ops video_qops = {
+static const struct videobuf_queue_ops video_qops = {
 	.buf_setup    = buffer_setup,
 	.buf_prepare  = buffer_prepare,
 	.buf_queue    = buffer_queue,