net/mlx5_core: fix an error code

We return success if mlx5e_alloc_sq_db() fails but we should return an
error code.

Fixes: f62b8bb8 ('net/mlx5: Extend mlx5_core to support ConnectX-4 Ethernet functionality')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -525,7 +525,8 @@ static int mlx5e_create_sq(struct mlx5e_channel *c,
 	sq->uar_map     = sq->uar.map;
 	sq->bf_buf_size = (1 << MLX5_CAP_GEN(mdev, log_bf_reg_size)) / 2;
 
-	if (mlx5e_alloc_sq_db(sq, cpu_to_node(c->cpu)))
+	err = mlx5e_alloc_sq_db(sq, cpu_to_node(c->cpu));
+	if (err)
 		goto err_sq_wq_destroy;
 
 	sq->txq = netdev_get_tx_queue(priv->netdev,