tlm/bookie: pkg/engine/engine.go; 7 LoC

Found a possible issue in [tlm/bookie](https://www.github.com/tlm/bookie) at [pkg/engine/engine.go](https://github.com/tlm/bookie/blob/181abaa7a32d5f81088b4090098fb45697618937/pkg/engine/engine.go#L76-L82)

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.

> range-loop variable c used in defer or goroutine at line 79

[Click here to see the code in its original context.](https://github.com/tlm/bookie/blob/181abaa7a32d5f81088b4090098fb45697618937/pkg/engine/engine.go#L76-L82)

Click here to show the 7 line(s) of Go which triggered the analyzer.

```go
for _, c := range e.controllers {
e.waitGroup.Add(1)
go func() {
c.Run(e.stopCh)
e.waitGroup.Done()
}()
}

```

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: 181abaa7a32d5f81088b4090098fb45697618937

Inspect pkg/engine/engine.go lines 76-82 and the linked analyzer context, then compare the finding with the repository's intended behavior. Leave the requested reaction classifying it as Bug, Mitigated, or Desirable Behavior.

Written by the indexing model from the issue text.