drivers/net: const-ify ethtool_ops declarations

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/ioc3-eth.c b/drivers/net/ioc3-eth.c
index fbda761..7acba88 100644
--- a/drivers/net/ioc3-eth.c
+++ b/drivers/net/ioc3-eth.c
@@ -115,7 +115,7 @@
 static void ioc3_init(struct net_device *dev);
 
 static const char ioc3_str[] = "IOC3 Ethernet";
-static struct ethtool_ops ioc3_ethtool_ops;
+static const struct ethtool_ops ioc3_ethtool_ops;
 
 /* We use this to acquire receive skb's that we can DMA directly into. */
 
@@ -1580,7 +1580,7 @@
 	return rc;
 }
 
-static struct ethtool_ops ioc3_ethtool_ops = {
+static const struct ethtool_ops ioc3_ethtool_ops = {
 	.get_drvinfo		= ioc3_get_drvinfo,
 	.get_settings		= ioc3_get_settings,
 	.set_settings		= ioc3_set_settings,