[media] v4l2: pass std by value to the write-only s_std ioctl

This ioctl is defined as IOW, so pass the argument by value instead of by
reference. I could have chosen to add const instead, but this is 1) easier
to handle in drivers and 2) consistent with the s_std subdev operation.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Jonathan Corbet <corbet@lwn.net>
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>

drivers/media/usb/usbvision/usbvision-video.c

@@ -595,11 +595,11 @@ static int vidioc_s_input(struct file *file, void *priv, unsigned int input)
 	return 0;
 }
 
-static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *id)
+static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id id)
 {
 	struct usb_usbvision *usbvision = video_drvdata(file);
 
-	usbvision->tvnorm_id = *id;
+	usbvision->tvnorm_id = id;
 
 	call_all(usbvision, core, s_std, usbvision->tvnorm_id);
 	/* propagate the change to the decoder */