gebv/ffsm: fsm.go; 88 LoC

Found a possible issue in [gebv/ffsm](https://www.github.com/gebv/ffsm) at [fsm.go](https://github.com/gebv/ffsm/blob/96f90d78dea231aefa4d17d47999f1ec3ffd4b24/fsm.go#L149-L236)

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 m used in defer or goroutine at line 192

[Click here to see the code in its original context.](https://github.com/gebv/ffsm/blob/96f90d78dea231aefa4d17d47999f1ec3ffd4b24/fsm.go#L149-L236)

Click here to show the 88 line(s) of Go which triggered the analyzer.

```go
for m := range e.toDispatch {
atomic.AddUint64(&e.numProcessed, 1)
dispatchStart = time.Now()
err = nil
current = e.State()

if current == UnknownState {
if m.done != nil {
m.done <- ErrNotInitalState
continue
}
}

actions = e.wf.Get(current, m.next)
if actions == nil {
m.done <- ErrNotRegTransition
continue
}

if m.ctx.Err() != nil {
m.done <- m.ctx.Err()
continue
}

nextCtx, cancel := context.WithCancel(hydrateContextForAction(m.ctx, current, m.next))
defer cancel()

for _i, actionFn := range actions {
actionStart = time.Now()
actionRes = make(chan resultOfActionTransition, 1)

// For simple FSM, without transition handlers
if actionFn == nil {
continue
}

go func(ctx context.Context) {
defer func() {
if r := recover(); r != nil {
actionRes <- resultOfActionTransition{
err: dispatcherError{
Recover: r,
SrcState: current,
DstState: m.next,
IndexAction: _i,
DebugStack: string(debug.Stack()),
},
}
return
}
}()

ctx, err := actionFn(nextCtx)
actionRes <- resultOfActionTransition{
err: err,
ctx: ctx,
}
}(nextCtx)

// waiting done action
select {
case done := <-actionRes:
nextCtx = done.ctx
err = done.err
}

actName := fmt.Sprintf("%q -> %q #%d", current, m.next, _i)
e.mActionDuration.WithLabelValues(actName).Observe(float64(time.Since(actionStart).Nanoseconds() / int64(time.Millisecond)))
e.mActionRequest.WithLabelValues(actName).Inc()

if err != nil {
// exit transition, because there was an error on one
// of the handlers of transition
break
}

// forend actions
}

if err == nil {
e.SetState(m.next)
}
m.done <- err

e.mActionDuration.WithLabelValues(e.name).Observe(float64(time.Since(dispatchStart).Nanoseconds() / int64(time.Millisecond)))
e.mTotalRequest.WithLabelValues(e.name).Inc()

} // forend dispatch

```

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See the descriptions of the classifications [here](https://github.com/github-vet/rangeclosure-findings#how-can-i-help) for more information.

commit ID: 96f90d78dea231aefa4d17d47999f1ec3ffd4b24