Cropsey/fsp: bottleneck.go; 7 LoC

Found a possible issue in [Cropsey/fsp](https://www.github.com/Cropsey/fsp) at [bottleneck.go](https://github.com/Cropsey/fsp/blob/85a7f9b51927132fa464b3631bb0b798d2e8003c/bottleneck.go#L49-L55)

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.

> function call at line 50 may store a reference to f

[Click here to see the code in its original context.](https://github.com/Cropsey/fsp/blob/85a7f9b51927132fa464b3631bb0b798d2e8003c/bottleneck.go#L49-L55)

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

```go
for _, f := range b {
partial.fly(&f)
tb := time.Duration(timePerBtn) * time.Millisecond
printInfo("running dfs from bottleneck for", tb)
d.dfs(comm, &partial, time.After(tb))
partial.backtrack()
}

```

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commit ID: 85a7f9b51927132fa464b3631bb0b798d2e8003c