ixgbe: make ethtool strings table const

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c

@@ -58,7 +58,7 @@ struct ixgbe_stats {
 				sizeof(((struct rtnl_link_stats64 *)0)->m), \
 				offsetof(struct rtnl_link_stats64, m)
 
-static struct ixgbe_stats ixgbe_gstrings_stats[] = {
+static const struct ixgbe_stats ixgbe_gstrings_stats[] = {
 	{"rx_packets", IXGBE_NETDEV_STAT(rx_packets)},
 	{"tx_packets", IXGBE_NETDEV_STAT(tx_packets)},
 	{"rx_bytes", IXGBE_NETDEV_STAT(rx_bytes)},