net/mlx4_en: Can set maxrate only for TC0

Had a typo in memcpy.
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c

@@ -237,7 +237,7 @@ static int mlx4_en_dcbnl_ieee_setmaxrate(struct net_device *dev,
 	if (err)
 		return err;
 
-	memcpy(priv->maxrate, tmp, sizeof(*priv->maxrate));
+	memcpy(priv->maxrate, tmp, sizeof(priv->maxrate));
 
 	return 0;
 }