media: bt8xx: make bttv_vbi_qops const

Make this const as it is only passed to the const argument of the
function videobuf_queue_sg_init in the file referencing it.
Also, make the declaration in the header const.

Structure found using Coccinelle and changes done by hand.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/pci/bt8xx/bttv-vbi.c

@@ -233,7 +233,7 @@ static void vbi_buffer_release(struct videobuf_queue *q, struct videobuf_buffer
 	bttv_dma_free(q,fh->btv,buf);
 }
 
-struct videobuf_queue_ops bttv_vbi_qops = {
+const struct videobuf_queue_ops bttv_vbi_qops = {
 	.buf_setup    = vbi_buffer_setup,
 	.buf_prepare  = vbi_buffer_prepare,
 	.buf_queue    = vbi_buffer_queue,

drivers/media/pci/bt8xx/bttvp.h

@@ -281,7 +281,7 @@ int bttv_try_fmt_vbi_cap(struct file *file, void *fh, struct v4l2_format *f);
 int bttv_g_fmt_vbi_cap(struct file *file, void *fh, struct v4l2_format *f);
 int bttv_s_fmt_vbi_cap(struct file *file, void *fh, struct v4l2_format *f);
 
-extern struct videobuf_queue_ops bttv_vbi_qops;
+extern const struct videobuf_queue_ops bttv_vbi_qops;
 
 /* ---------------------------------------------------------- */
 /* bttv-gpio.c */