drivers/net: const-ify ethtool_ops declarations

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/via-velocity.c b/drivers/net/via-velocity.c
index a0f7820..dd472b6 100644
--- a/drivers/net/via-velocity.c
+++ b/drivers/net/via-velocity.c
@@ -86,7 +86,7 @@
 
 
 static int velocity_mii_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
-static struct ethtool_ops velocity_ethtool_ops;
+static const struct ethtool_ops velocity_ethtool_ops;
 
 /*
     Define module options
@@ -2971,7 +2971,7 @@
 	 msglevel = value;
 }
 
-static struct ethtool_ops velocity_ethtool_ops = {
+static const struct ethtool_ops velocity_ethtool_ops = {
 	.get_settings	=	velocity_get_settings,
 	.set_settings	=	velocity_set_settings,
 	.get_drvinfo	=	velocity_get_drvinfo,