drivers/net: const-ify ethtool_ops declarations

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/dl2k.c b/drivers/net/dl2k.c
index 5c520f6..c5c80da 100644
--- a/drivers/net/dl2k.c
+++ b/drivers/net/dl2k.c
@@ -83,7 +83,7 @@
 static int mii_write (struct net_device *dev, int phy_addr, int reg_num,
 		      u16 data);
 
-static struct ethtool_ops ethtool_ops;
+static const struct ethtool_ops ethtool_ops;
 
 static int __devinit
 rio_probe1 (struct pci_dev *pdev, const struct pci_device_id *ent)
@@ -1261,7 +1261,7 @@
 	return np->link_status;
 }
 
-static struct ethtool_ops ethtool_ops = {
+static const struct ethtool_ops ethtool_ops = {
 	.get_drvinfo = rio_get_drvinfo,
 	.get_settings = rio_get_settings,
 	.set_settings = rio_set_settings,