net/mlx4_en: Prepare ethtool private flags to support more flags

Currently we support only one ethtool private flag. Prepare
mlx4_en_set_priv_flags function to support more than one private flag.
Will be used in the next patch to support hardware accelerated 802.1ad
vlan.
Signed-off-by: NHadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: NAmir Vadai <amirv@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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

@@ -1801,9 +1801,7 @@ static int mlx4_en_set_priv_flags(struct net_device *dev, u32 flags)
 	bool bf_enabled_old = !!(priv->pflags & MLX4_EN_PRIV_FLAGS_BLUEFLAME);
 	int i;
 
-	if (bf_enabled_new == bf_enabled_old)
-		return 0; /* Nothing to do */
-
+	if (bf_enabled_new != bf_enabled_old) {
 		if (bf_enabled_new) {
 			bool bf_supported = true;
 
@@ -1825,6 +1823,7 @@ static int mlx4_en_set_priv_flags(struct net_device *dev, u32 flags)
 
 		en_info(priv, "BlueFlame %s\n",
 			bf_enabled_new ?  "Enabled" : "Disabled");
+	}
 
 	return 0;
 }