net/mlx5: fix socket connection return value

Upon success, mlx5_socket_connect should return the fd descriptor of the
primary process

Fixes: a6d83b6a9209 ("net/mlx5: standardize on negative errno values")

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>

drivers/net/mlx5/mlx5.c

@@ -804,7 +804,7 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
 				goto error;
 			/* Receive command fd from primary process */
 			err = mlx5_socket_connect(eth_dev);
-			if (err)
+			if (err < 0)
 				goto error;
 			/* Remap UAR for Tx queues. */
 			err = mlx5_tx_uar_remap(eth_dev, err);

drivers/net/mlx5/mlx5_socket.c

@@ -294,7 +294,7 @@ mlx5_socket_connect(struct rte_eth_dev *dev)
 	}
 	ret = *fd;
 	close(socket_fd);
-	return 0;
+	return ret;
 error:
 	if (socket_fd != -1)
 		close(socket_fd);