media: usb: make video_device const

Make these const as they are only used during a copy operation.

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Acked-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
diff --git a/drivers/media/usb/pwc/pwc-if.c b/drivers/media/usb/pwc/pwc-if.c
index 22420c1..eb6921d 100644
--- a/drivers/media/usb/pwc/pwc-if.c
+++ b/drivers/media/usb/pwc/pwc-if.c
@@ -146,7 +146,7 @@
 	.mmap =		vb2_fop_mmap,
 	.unlocked_ioctl = video_ioctl2,
 };
-static struct video_device pwc_template = {
+static const struct video_device pwc_template = {
 	.name =		"Philips Webcam",	/* Filled in later */
 	.release =	video_device_release_empty,
 	.fops =         &pwc_fops,