drivers/net: const-ify ethtool_ops declarations

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 4d66d86..3b84ac2 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -8962,7 +8962,7 @@
 	return 0;
 }
 
-static struct ethtool_ops tg3_ethtool_ops = {
+static const struct ethtool_ops tg3_ethtool_ops = {
 	.get_settings		= tg3_get_settings,
 	.set_settings		= tg3_set_settings,
 	.get_drvinfo		= tg3_get_drvinfo,