net: rswitch: Fix type of ret in rswitch_start_xmit()

The type of ret in rswitch_start_xmit() should be netdev_tx_t. So,
fix it.

Fixes: 3590918b ("net: ethernet: renesas: Add support for "Ethernet Switch"")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/rswitch.c

@@ -1504,8 +1504,8 @@ static netdev_tx_t rswitch_start_xmit(struct sk_buff *skb, struct net_device *nd
 {
 	struct rswitch_device *rdev = netdev_priv(ndev);
 	struct rswitch_gwca_queue *gq = rdev->tx_queue;
+	netdev_tx_t ret = NETDEV_TX_OK;
 	struct rswitch_ext_desc *desc;
-	int ret = NETDEV_TX_OK;
 	dma_addr_t dma_addr;
 
 	if (rswitch_get_num_cur_queues(gq) >= gq->ring_size - 1) {