media: subdev: Constify v4l2_subdev_set_routing_with_fmt() param

The routing parameter of v4l2_subdev_set_routing_with_fmt() is missing
'const'. Add it.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/v4l2-core/v4l2-subdev.c

@@ -1602,7 +1602,7 @@ EXPORT_SYMBOL_GPL(__v4l2_subdev_next_active_route);
 
 int v4l2_subdev_set_routing_with_fmt(struct v4l2_subdev *sd,
 				     struct v4l2_subdev_state *state,
-				     struct v4l2_subdev_krouting *routing,
+				     const struct v4l2_subdev_krouting *routing,
 				     const struct v4l2_mbus_framefmt *fmt)
 {
 	struct v4l2_subdev_stream_configs *stream_configs;

include/media/v4l2-subdev.h

@@ -1535,7 +1535,7 @@ __v4l2_subdev_next_active_route(const struct v4l2_subdev_krouting *routing,
  */
 int v4l2_subdev_set_routing_with_fmt(struct v4l2_subdev *sd,
 				     struct v4l2_subdev_state *state,
-				     struct v4l2_subdev_krouting *routing,
+				     const struct v4l2_subdev_krouting *routing,
 				     const struct v4l2_mbus_framefmt *fmt);
 
 /**