[media] uvcvideo: Return -ENOTTY in case of unknown ioctl

-EINVAL is the wrong error code in that case, replace it with -ENOTTY.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c
index 2ae4f88..f09ee8b 100644
--- a/drivers/media/video/uvc/uvc_v4l2.c
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -1012,7 +1012,7 @@
 
 	default:
 		uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n", cmd);
-		return -EINVAL;
+		return -ENOTTY;
 	}
 
 	return ret;