net/ethtool/ioctl: remove if n_stats checks from ethtool_get_phy_stats

Now that we always early return if we don't have any stats we can remove
these checks as they're no longer necessary.
Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ethtool/ioctl.c

@@ -2107,7 +2107,6 @@ static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
 
 	stats.n_stats = n_stats;
 
-	if (n_stats) {
 	data = vzalloc(array_size(n_stats, sizeof(u64)));
 	if (!data)
 		return -ENOMEM;
@@ -2120,15 +2119,12 @@ static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
 	} else {
 		ops->get_ethtool_phy_stats(dev, &stats, data);
 	}
-	} else {
-		data = NULL;
-	}
 
 	ret = -EFAULT;
 	if (copy_to_user(useraddr, &stats, sizeof(stats)))
 		goto out;
 	useraddr += sizeof(stats);
-	if (n_stats && copy_to_user(useraddr, data, array_size(n_stats, sizeof(u64))))
+	if (copy_to_user(useraddr, data, array_size(n_stats, sizeof(u64))))
 		goto out;
 	ret = 0;