AutoSpotting/AutoSpotting: core/instance.go; 15 LoC

Found a possible issue in [AutoSpotting/AutoSpotting](https://www.github.com/AutoSpotting/AutoSpotting) at [core/instance.go](https://github.com/AutoSpotting/AutoSpotting/blob/3a1f77a890f5dfbc1757aa0661c16c035ef069ea/core/instance.go#L242-L256)

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 asg is reassigned at line 250

[Click here to see the code in its original context.](https://github.com/AutoSpotting/AutoSpotting/blob/3a1f77a890f5dfbc1757aa0661c16c035ef069ea/core/instance.go#L242-L256)

Click here to show the 15 line(s) of Go which triggered the analyzer.

```go
for _, asg := range i.region.enabledASGs {
if asg.name == *asgName && asg.isEnabledForEventBasedInstanceReplacement() {
asg.config = i.region.conf.AutoScalingConfig
asg.scanInstances()
asg.loadDefaultConfig()
asg.loadConfigFromTags()
asg.loadLaunchConfiguration()
asg.loadLaunchTemplate()
i.asg = &asg
i.price = i.typeInfo.pricing.onDemand / i.region.conf.OnDemandPriceMultiplier * i.asg.config.OnDemandPriceMultiplier
logger.Printf("%s instace %s belongs to enabled ASG %s", i.region.name,
*i.InstanceId, i.asg.name)
return true
}
}

```

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commit ID: 3a1f77a890f5dfbc1757aa0661c16c035ef069ea