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/usb/dm9601.c b/drivers/net/usb/dm9601.c
index 1d3730d..72470f7 100644
--- a/drivers/net/usb/dm9601.c
+++ b/drivers/net/usb/dm9601.c
@@ -356,7 +356,7 @@
 	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
 }
 
-static struct ethtool_ops dm9601_ethtool_ops = {
+static const struct ethtool_ops dm9601_ethtool_ops = {
 	.get_drvinfo	= dm9601_get_drvinfo,
 	.get_link	= dm9601_get_link,
 	.get_msglevel	= usbnet_get_msglevel,