s390/qeth: use correct return type for hard_start_xmit()

ndo_start_xmit() expects us to return netdev_tx_t here...
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Acked-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/s390/net/qeth_l2_main.c

@@ -681,7 +681,8 @@ static void qeth_l2_set_rx_mode(struct net_device *dev)
 		qeth_promisc_to_bridge(card);
 }
 
-static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
+					   struct net_device *dev)
 {
 	int rc;
 	struct qeth_hdr *hdr = NULL;

drivers/s390/net/qeth_l3_main.c

@@ -2655,7 +2655,8 @@ static int qeth_l3_get_elements_no_tso(struct qeth_card *card,
 	return elements;
 }
 
-static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb,
+					   struct net_device *dev)
 {
 	int rc;
 	__be16 *tag;