net/mlx5e: Remove redundant check in get ethtool stats

ethtool core code makes sure data isn't NULL before calling
get_ethtool_stats, testing it again in the driver is redundant.
Signed-off-by: Gal Pressman <galp@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c

@@ -203,9 +203,6 @@ void mlx5e_ethtool_get_ethtool_stats(struct mlx5e_priv *priv,
 {
 	int i, idx = 0;
 
-	if (!data)
-		return;
-
 	mutex_lock(&priv->state_lock);
 	mlx5e_update_stats(priv);
 	mutex_unlock(&priv->state_lock);