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/drivers/usb/gadget/u_ether.c b/drivers/usb/gadget/u_ether.c
index aac69b5..dc3ebd1 100644
--- a/drivers/usb/gadget/u_ether.c
+++ b/drivers/usb/gadget/u_ether.c
@@ -465,7 +465,8 @@
 	return cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS;
 }
 
-static int eth_start_xmit(struct sk_buff *skb, struct net_device *net)
+static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
+					struct net_device *net)
 {
 	struct eth_dev		*dev = netdev_priv(net);
 	int			length = skb->len;