[media] saa7146: make saa7146_use_ops const

Make these const as they are not modified in the file referencing them.
They are only used when their function pointer fields invokes a
function and therefore none of the structure fields are getting modified.
Also, add a const to the declaration in the header.
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/common/saa7146/saa7146_vbi.c

@@ -488,7 +488,7 @@ static ssize_t vbi_read(struct file *file, char __user *data, size_t count, loff
 	return ret;
 }
 
-struct saa7146_use_ops saa7146_vbi_uops = {
+const struct saa7146_use_ops saa7146_vbi_uops = {
 	.init		= vbi_init,
 	.open		= vbi_open,
 	.release	= vbi_close,

drivers/media/common/saa7146/saa7146_video.c

@@ -1303,7 +1303,7 @@ static ssize_t video_read(struct file *file, char __user *data, size_t count, lo
 	return ret;
 }
 
-struct saa7146_use_ops saa7146_video_uops = {
+const struct saa7146_use_ops saa7146_video_uops = {
 	.init = video_init,
 	.open = video_open,
 	.release = video_close,

include/media/drv-intf/saa7146_vv.h

@@ -202,14 +202,14 @@ void saa7146_set_gpio(struct saa7146_dev *saa, u8 pin, u8 data);
 /* from saa7146_video.c */
 extern const struct v4l2_ioctl_ops saa7146_video_ioctl_ops;
 extern const struct v4l2_ioctl_ops saa7146_vbi_ioctl_ops;
-extern struct saa7146_use_ops saa7146_video_uops;
+extern const struct saa7146_use_ops saa7146_video_uops;
 int saa7146_start_preview(struct saa7146_fh *fh);
 int saa7146_stop_preview(struct saa7146_fh *fh);
 long saa7146_video_do_ioctl(struct file *file, unsigned int cmd, void *arg);
 int saa7146_s_ctrl(struct v4l2_ctrl *ctrl);
 
 /* from saa7146_vbi.c */
-extern struct saa7146_use_ops saa7146_vbi_uops;
+extern const struct saa7146_use_ops saa7146_vbi_uops;
 
 /* resource management functions */
 int saa7146_res_get(struct saa7146_fh *fh, unsigned int bit);