media: v4l2-subdev: fix #endif comments

Add comments after #endifs to clarify their scope.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

include/media/v4l2-subdev.h

@@ -1023,7 +1023,7 @@ v4l2_subdev_get_try_compose(struct v4l2_subdev *sd,
 	return &state->pads[pad].try_compose;
 }
 
-#endif
+#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
 
 extern const struct v4l2_file_operations v4l2_subdev_fops;
 
@@ -1204,4 +1204,4 @@ extern const struct v4l2_subdev_ops v4l2_subdev_call_wrappers;
 void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
 			      const struct v4l2_event *ev);
 
-#endif
+#endif /* _V4L2_SUBDEV_H */