net: nb8800: fix nb8800_xmit()'s return type

The method ndo_start_xmit() is defined as returning an 'netdev_tx_t',
which is a typedef for an enum type, but the implementation in this
driver returns an 'int'.

Fix this by returning 'netdev_tx_t' in this driver too.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/aurora/nb8800.c

@@ -384,7 +384,7 @@ static void nb8800_tx_dma_start_irq(struct net_device *dev)
 	spin_unlock(&priv->tx_lock);
 }
 
-static int nb8800_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t nb8800_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct nb8800_priv *priv = netdev_priv(dev);
 	struct nb8800_tx_desc *txd;