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/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 44389c9..858f455 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -7755,7 +7755,7 @@ static int rtl_open(struct net_device *dev)
 	goto out;
 }
 
-static struct rtnl_link_stats64 *
+static void
 rtl8169_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 {
 	struct rtl8169_private *tp = netdev_priv(dev);
@@ -7809,8 +7809,6 @@ rtl8169_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 		le16_to_cpu(tp->tc_offset.tx_aborted);
 
 	pm_runtime_put_noidle(&pdev->dev);
-
-	return stats;
 }
 
 static void rtl8169_net_suspend(struct net_device *dev)