usbnet: Add stop function pointer to 'struct rndis_data'.

Allow minidriver to know that netdev has stopped. This is to let
wireless turn off radio when usbnet dev is stopped.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
index 310e18a..7c17b2e 100644
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -97,6 +97,9 @@
 	/* reset device ... can sleep */
 	int	(*reset)(struct usbnet *);
 
+	/* stop device ... can sleep */
+	int	(*stop)(struct usbnet *);
+
 	/* see if peer is connected ... can sleep */
 	int	(*check_connect)(struct usbnet *);