net/mlx4_en: clear some TX ring stats in mlx4_en_clear_stats()

mlx4_en_clear_stats() clears about everything but few TX ring
fields are missing :
- queue_stopped, wake_queue, tso_packets, xmit_more
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/en_netdev.c

@@ -1893,6 +1893,10 @@ static void mlx4_en_clear_stats(struct net_device *dev)
 		priv->tx_ring[i]->packets = 0;
 		priv->tx_ring[i]->tx_csum = 0;
 		priv->tx_ring[i]->tx_dropped = 0;
+		priv->tx_ring[i]->queue_stopped = 0;
+		priv->tx_ring[i]->wake_queue = 0;
+		priv->tx_ring[i]->tso_packets = 0;
+		priv->tx_ring[i]->xmit_more = 0;
 	}
 	for (i = 0; i < priv->rx_ring_num; i++) {
 		priv->rx_ring[i]->bytes = 0;