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

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

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Alexey Klimov <klimov.linux@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index f06436d..0da8682 100644
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -219,7 +219,7 @@
 	int (*vidioc_g_tuner)          (struct file *file, void *fh,
 					struct v4l2_tuner *a);
 	int (*vidioc_s_tuner)          (struct file *file, void *fh,
-					struct v4l2_tuner *a);
+					const struct v4l2_tuner *a);
 	int (*vidioc_g_frequency)      (struct file *file, void *fh,
 					struct v4l2_frequency *a);
 	int (*vidioc_s_frequency)      (struct file *file, void *fh,