net: socionext: Fix use correct return type for ndo_start_xmit()

The method ndo_start_xmit() returns a value of type netdev_tx_t. Fix
the ndo function to use the correct type.
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/socionext/sni_ave.c

@@ -1394,7 +1394,7 @@ static int ave_stop(struct net_device *ndev)
 	return 0;
 }
 
-static int ave_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+static netdev_tx_t ave_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 {
 	struct ave_private *priv = netdev_priv(ndev);
 	u32 proc_idx, done_idx, ndesc, cmdsts;