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/sfc/ethtool.h b/drivers/net/sfc/ethtool.h
index 3628e43..295ead4 100644
--- a/drivers/net/sfc/ethtool.h
+++ b/drivers/net/sfc/ethtool.h
@@ -22,6 +22,6 @@
 extern int efx_ethtool_set_settings(struct net_device *net_dev,
 				    struct ethtool_cmd *ecmd);
 
-extern struct ethtool_ops efx_ethtool_ops;
+extern const struct ethtool_ops efx_ethtool_ops;
 
 #endif /* EFX_ETHTOOL_H */