cortexlabs/cortex: pkg/operator/endpoints/info.go; 30 LoC

Found a possible issue in [cortexlabs/cortex](https://www.github.com/cortexlabs/cortex) at [pkg/operator/endpoints/info.go](https://github.com/cortexlabs/cortex/blob/2f8d0cf42f6369cadfe9c9c7dc8de2a45a459b72/pkg/operator/endpoints/info.go#L72-L101)

Below is the message reported by the analyzer for this snippet of code. Beware that the analyzer only reports the first issue it finds, so please do not limit your consideration to the contents of the below message.

> reference to node was used in a composite literal at line 97

[Click here to see the code in its original context.](https://github.com/cortexlabs/cortex/blob/2f8d0cf42f6369cadfe9c9c7dc8de2a45a459b72/pkg/operator/endpoints/info.go#L72-L101)

Click here to show the 30 line(s) of Go which triggered the analyzer.

```go
for _, node := range nodes {
instanceType := node.Labels["beta.kubernetes.io/instance-type"]
isSpot := strings.Contains(strings.ToLower(node.Labels["lifecycle"]), "spot")

price := aws.InstanceMetadatas[*config.Cluster.Region][instanceType].Price
if isSpot {
if spotPrice, ok := spotPriceCache[instanceType]; ok {
price = spotPrice
} else {
spotPrice, err := config.AWS.SpotInstancePrice(instanceType)
if err == nil && spotPrice != 0 {
price = spotPrice
spotPriceCache[instanceType] = spotPrice
} else {
spotPriceCache[instanceType] = price // the request failed, so no need to try again in the future
}
}
}

nodeInfoMap[node.Name] = &schema.NodeInfo{
Name: node.Name,
InstanceType: instanceType,
IsSpot: isSpot,
Price: price,
NumReplicas: 0, // will be added to below
ComputeUserCapacity: nodeComputeAllocatable(&node), // will be subtracted from below
ComputeAvailable: nodeComputeAllocatable(&node), // will be subtracted from below
ComputeUserRequested: userconfig.ZeroCompute(), // will be added to below
}
}

```

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commit ID: 2f8d0cf42f6369cadfe9c9c7dc8de2a45a459b72