net: Remove unnecessary driver assignments of ethtool_ringparam fields to zero

Per comments from Ben Hutchings on a previous patch, sweep the floors
a little removing unnecessary assignments of zero to fields of struct
ethtool_ringparam in driver code supporting ethtool -g.

Signed-off-by: Rick Jones <rick.jones2@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/sky2.c

@@ -4088,13 +4088,9 @@ static void sky2_get_ringparam(struct net_device *dev,
 	struct sky2_port *sky2 = netdev_priv(dev);
 
 	ering->rx_max_pending = RX_MAX_PENDING;
-	ering->rx_mini_max_pending = 0;
-	ering->rx_jumbo_max_pending = 0;
 	ering->tx_max_pending = TX_MAX_PENDING;
 
 	ering->rx_pending = sky2->rx_pending;
-	ering->rx_mini_pending = 0;
-	ering->rx_jumbo_pending = 0;
 	ering->tx_pending = sky2->tx_pending;
 }