sfc: Replace net_dev->priv with netdev_priv(net_dev)

Use of the net_device::priv field is deprecated.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/net/sfc/tx.c b/drivers/net/sfc/tx.c
index 5e8374a..2a09101 100644
--- a/drivers/net/sfc/tx.c
+++ b/drivers/net/sfc/tx.c
@@ -367,7 +367,7 @@
  */
 int efx_hard_start_xmit(struct sk_buff *skb, struct net_device *net_dev)
 {
-	struct efx_nic *efx = net_dev->priv;
+	struct efx_nic *efx = netdev_priv(net_dev);
 	return efx_xmit(efx, &efx->tx_queue[0], skb);
 }