net/mlx4_en: Fix the return value of mlx4_en_dcbnl_set_all()

mlx4_en_dcbnl_set_all() returns u8, so return value can't be negative in
case of failure.

Fixes: af7d5185 ("net/mlx4_en: Add DCB PFC support through CEE netlink commands")
Signed-off-by: Kamal Heib <kamalh@mellanox.com>
Signed-off-by: Rana Shahout <ranas@mellanox.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -158,10 +158,9 @@ static u8 mlx4_en_dcbnl_set_all(struct net_device *netdev)
 	struct mlx4_en_priv *priv = netdev_priv(netdev);
 	struct mlx4_en_dev *mdev = priv->mdev;
 	struct mlx4_en_cee_config *dcb_cfg = &priv->cee_params.dcb_cfg;
-	int err = 0;
 
 	if (!(priv->cee_params.dcbx_cap & DCB_CAP_DCBX_VER_CEE))
-		return -EINVAL;
+		return 1;
 
 	if (dcb_cfg->pfc_state) {
 		int tc;
@@ -199,15 +198,17 @@ static u8 mlx4_en_dcbnl_set_all(struct net_device *netdev)
 		en_dbg(DRV, priv, "Set pfc off\n");
 	}
 
-	err = mlx4_SET_PORT_general(mdev->dev, priv->port,
+	if (mlx4_SET_PORT_general(mdev->dev, priv->port,
 				  priv->rx_skb_size + ETH_FCS_LEN,
 				  priv->prof->tx_pause,
 				  priv->prof->tx_ppp,
 				  priv->prof->rx_pause,
-				    priv->prof->rx_ppp);
-	if (err)
+				  priv->prof->rx_ppp)) {
 		en_err(priv, "Failed setting pause params\n");
-	return err;
+		return 1;
+	}
+
+	return 0;
 }
 
 static u8 mlx4_en_dcbnl_get_state(struct net_device *dev)