[media] v4l2: add const to argument of write-only s_register ioctl

This ioctl is defined as IOW, so pass the argument as const.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/usb/gspca/gspca.h b/drivers/media/usb/gspca/gspca.h
index c3af321..ef8efeb 100644
--- a/drivers/media/usb/gspca/gspca.h
+++ b/drivers/media/usb/gspca/gspca.h
@@ -74,8 +74,10 @@
 				struct v4l2_jpegcompression *);
 typedef int (*cam_set_jpg_op) (struct gspca_dev *,
 				const struct v4l2_jpegcompression *);
-typedef int (*cam_reg_op) (struct gspca_dev *,
+typedef int (*cam_get_reg_op) (struct gspca_dev *,
 				struct v4l2_dbg_register *);
+typedef int (*cam_set_reg_op) (struct gspca_dev *,
+				const struct v4l2_dbg_register *);
 typedef int (*cam_ident_op) (struct gspca_dev *,
 				struct v4l2_dbg_chip_ident *);
 typedef void (*cam_streamparm_op) (struct gspca_dev *,
@@ -108,8 +110,8 @@
 	cam_streamparm_op get_streamparm;
 	cam_streamparm_op set_streamparm;
 #ifdef CONFIG_VIDEO_ADV_DEBUG
-	cam_reg_op set_register;
-	cam_reg_op get_register;
+	cam_set_reg_op set_register;
+	cam_get_reg_op get_register;
 #endif
 	cam_ident_op get_chip_ident;
 #if IS_ENABLED(CONFIG_INPUT)