V4L/DVB: use correct size in put_v4l2_window32()

Although these sizes may be the same it is better to calculate the size of
the source, than the destiny.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/v4l2-compat-ioctl32.c

@@ -288,7 +288,7 @@ static int get_v4l2_window32(struct v4l2_window *kp, struct v4l2_window32 __user
 
 static int put_v4l2_window32(struct v4l2_window *kp, struct v4l2_window32 __user *up)
 {
-	if (copy_to_user(&up->w, &kp->w, sizeof(up->w)) ||
+	if (copy_to_user(&up->w, &kp->w, sizeof(kp->w)) ||
 		put_user(kp->field, &up->field) ||
 		put_user(kp->chromakey, &up->chromakey) ||
 		put_user(kp->clipcount, &up->clipcount))