net: make ndo_get_stats64 a void function

The network device operation for reading statistics is only called
in one place, and it ignores the return value. Having a structure
return value is potentially confusing because some future driver could
incorrectly assume that the return value was used.

Fix all drivers with ndo_get_stats64 to have a void function.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 41497b6..77e8a42 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1122,7 +1122,7 @@ static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 	return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 }
 
-static struct rtnl_link_stats64 *
+static void
 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 {
 	int i;
@@ -1147,8 +1147,6 @@ ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 		stats->rx_bytes   += rx_bytes;
 		stats->tx_bytes   += tx_bytes;
 	}
-
-	return stats;
 }
 
 static const struct net_device_ops ieee80211_dataif_ops = {