drivers/net: const-ify ethtool_ops declarations

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index b19e203..2773440 100644
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -1389,7 +1389,7 @@
 	return mgp->msg_enable;
 }
 
-static struct ethtool_ops myri10ge_ethtool_ops = {
+static const struct ethtool_ops myri10ge_ethtool_ops = {
 	.get_settings = myri10ge_get_settings,
 	.get_drvinfo = myri10ge_get_drvinfo,
 	.get_coalesce = myri10ge_get_coalesce,