aliyun/terraform-provider-alicloud: alicloud/resource_alicloud_ess_scalinggroup.go; 14 LoC

Found a possible issue in [aliyun/terraform-provider-alicloud](https://www.github.com/aliyun/terraform-provider-alicloud) at [alicloud/resource_alicloud_ess_scalinggroup.go](https://github.com/aliyun/terraform-provider-alicloud/blob/9cb719e30072d215adf672530119a2094da8ca48/alicloud/resource_alicloud_ess_scalinggroup.go#L452-L465)

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 subList is reassigned at line 457

[Click here to see the code in its original context.](https://github.com/aliyun/terraform-provider-alicloud/blob/9cb719e30072d215adf672530119a2094da8ca48/alicloud/resource_alicloud_ess_scalinggroup.go#L452-L465)

Click here to show the 14 line(s) of Go which triggered the analyzer.

```go
for _, subList := range subLists {
attachDbInstancesRequest := ess.CreateAttachDBInstancesRequest()
attachDbInstancesRequest.RegionId = client.RegionId
attachDbInstancesRequest.ScalingGroupId = d.Id()
attachDbInstancesRequest.ForceAttach = requests.NewBoolean(true)
attachDbInstancesRequest.DBInstance = &subList
raw, err := client.WithEssClient(func(essClient *ess.Client) (interface{}, error) {
return essClient.AttachDBInstances(attachDbInstancesRequest)
})
if err != nil {
return WrapErrorf(err, DefaultErrorMsg, d.Id(), attachDbInstancesRequest.GetActionName(), AlibabaCloudSdkGoERROR)
}
addDebug(attachDbInstancesRequest.GetActionName(), raw, attachDbInstancesRequest.RpcRequest, attachDbInstancesRequest)
}

```

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commit ID: 9cb719e30072d215adf672530119a2094da8ca48