[PATCH net-next] l2tp: fix return type of ndo_start_xmit function

[YueHaibing]

The method ndo_start_xmit() is defined as returning an 'netdev_tx_t',
which is a typedef for an enum type, so make sure the implementation in
this driver has returns 'netdev_tx_t' value, and change the function
return type to netdev_tx_t.

Found by coccinelle.

Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 net/l2tp/l2tp_eth.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
index 8aadc4f..4173cb1 100644
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -77,7 +77,8 @@ static void l2tp_eth_dev_uninit(struct net_device *dev)
 	 */
 }
 
-static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t
+l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct l2tp_eth *priv = netdev_priv(dev);
 	struct l2tp_session *session = priv->session;
-- 
1.8.3.1