zdarovich/einvoice: services/documentService.go; 3 LoC

Found a possible issue in [zdarovich/einvoice](https://www.github.com/zdarovich/einvoice) at [services/documentService.go](https://github.com/zdarovich/einvoice/blob/032c1573630b73bca0998eee60f5eecf7bd34ee4/services/documentService.go#L34-L36)

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 res is reassigned at line 35

[Click here to see the code in its original context.](https://github.com/zdarovich/einvoice/blob/032c1573630b73bca0998eee60f5eecf7bd34ee4/services/documentService.go#L34-L36)

Click here to show the 3 line(s) of Go which triggered the analyzer.

```go
for _, res := range result {
exportMap[res.DocumentID] = &res
}

```

Leave a reaction on this issue to contribute to the project by classifying this instance as a **Bug** :-1:, **Mitigated** :+1:, or **Desirable Behavior** :rocket:
See the descriptions of the classifications [here](https://github.com/github-vet/rangeclosure-findings#how-can-i-help) for more information.

commit ID: 032c1573630b73bca0998eee60f5eecf7bd34ee4

Read services/documentService.go at lines 34-36 and review the analyzer message about the reference to res being reassigned. Decide whether the finding is a Bug, Mitigated, or Desirable Behavior, then leave the corresponding reaction on the issue.

Written by the indexing model from the issue text.