netdev: drivers should make ethtool_ops const

No need to put ethtool_ops in data, they should be const.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/arm/ixp4xx_eth.c b/drivers/net/arm/ixp4xx_eth.c
index 3fe0987..691b81e 100644
--- a/drivers/net/arm/ixp4xx_eth.c
+++ b/drivers/net/arm/ixp4xx_eth.c
@@ -802,7 +802,7 @@
 	return phy_start_aneg(port->phydev);
 }
 
-static struct ethtool_ops ixp4xx_ethtool_ops = {
+static const struct ethtool_ops ixp4xx_ethtool_ops = {
 	.get_drvinfo = ixp4xx_get_drvinfo,
 	.get_settings = ixp4xx_get_settings,
 	.set_settings = ixp4xx_set_settings,