netpoll: 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>

net/core/netpoll.c

@@ -69,10 +69,11 @@ module_param(carrier_timeout, uint, 0644);
 #define np_notice(np, fmt, ...)				\
 	pr_notice("%s: " fmt, np->name, ##__VA_ARGS__)
 
-static int netpoll_start_xmit(struct sk_buff *skb, struct net_device *dev,
-			      struct netdev_queue *txq)
+static netdev_tx_t netpoll_start_xmit(struct sk_buff *skb,
+				      struct net_device *dev,
+				      struct netdev_queue *txq)
 {
-	int status = NETDEV_TX_OK;
+	netdev_tx_t status = NETDEV_TX_OK;
 	netdev_features_t features;
 
 	features = netif_skb_features(skb);
@@ -307,7 +308,7 @@ static int netpoll_owner_active(struct net_device *dev)
 void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
 			     struct net_device *dev)
 {
-	int status = NETDEV_TX_BUSY;
+	netdev_tx_t status = NETDEV_TX_BUSY;
 	unsigned long tries;
 	/* It is up to the caller to keep npinfo alive. */
 	struct netpoll_info *npinfo;