hhh0pE/ggm: ggmgen/initStructFields.go; 17 LoC

Found a possible issue in [hhh0pE/ggm](https://www.github.com/hhh0pE/ggm) at [ggmgen/initStructFields.go](https://github.com/hhh0pE/ggm/blob/af393f7a93ba806faaabc35323a79c297290115b/ggmgen/initStructFields.go#L60-L76)

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 ff is reassigned at line 63

[Click here to see the code in its original context.](https://github.com/hhh0pE/ggm/blob/af393f7a93ba806faaabc35323a79c297290115b/ggmgen/initStructFields.go#L60-L76)

Click here to show the 17 line(s) of Go which triggered the analyzer.

```go
for _, ff := range foundFields {
if ff.IsForeignKey && ff.Relation != nil {
ff.Model = modelS
ff.Relation.Field = &ff

if ff.Relation.isOne2One {
var newOne2OneIndex modelIndex
newOne2OneIndex.isUnique = true
newOne2OneIndex.isCoalesce = true
newOne2OneIndex.modelName = ff.Relation.modelTo.Name
newOne2OneIndex.fieldNames = []string{ff.Relation.Field.Name}
modelS.indexes = append(modelS.indexes, newOne2OneIndex)
}
}
modelS.AddField(ff)
//fmt.Printf("%s: %#v\n", ff.Name, ff.Type)
}

```

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commit ID: af393f7a93ba806faaabc35323a79c297290115b