drivers/net: const-ify ethtool_ops declarations

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/iseries_veth.c b/drivers/net/iseries_veth.c
index cdc1440..41b1d08 100644
--- a/drivers/net/iseries_veth.c
+++ b/drivers/net/iseries_veth.c
@@ -1029,7 +1029,7 @@
 	return 1;
 }
 
-static struct ethtool_ops ops = {
+static const struct ethtool_ops ops = {
 	.get_drvinfo = veth_get_drvinfo,
 	.get_settings = veth_get_settings,
 	.get_link = veth_get_link,