usbnet: convert to netdev_tx_t

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
index 0951425..bb69e25 100644
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -182,7 +182,8 @@
 
 extern int usbnet_open (struct net_device *net);
 extern int usbnet_stop (struct net_device *net);
-extern int usbnet_start_xmit (struct sk_buff *skb, struct net_device *net);
+extern netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
+				      struct net_device *net);
 extern void usbnet_tx_timeout (struct net_device *net);
 extern int usbnet_change_mtu (struct net_device *net, int new_mtu);