FIWARE-GEs/fogflow: broker/thinBroker.go; 16 LoC

Found a possible issue in [FIWARE-GEs/fogflow](https://www.github.com/FIWARE-GEs/fogflow) at [broker/thinBroker.go](https://github.com/FIWARE-GEs/fogflow/blob/5f80356f216c2d7d1608c36fd0ea1d18104d4ec9/broker/thinBroker.go#L534-L549)

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 which takes a reference to ctxElem at line 545 may start a goroutine

[Click here to see the code in its original context.](https://github.com/FIWARE-GEs/fogflow/blob/5f80356f216c2d7d1608c36fd0ea1d18104d4ec9/broker/thinBroker.go#L534-L549)

Click here to show the 16 line(s) of Go which triggered the analyzer.

```go
for _, ctxElem := range updateCtxReq.ContextElements {
// just in case this is orion ngsi v1
ctxElem.SetEntityID()
// params[0] has FiwareService header and params[1] has FiwareServicePath
if fiwareHeadersExist {
tb.updateIdWithFiwareHeaders(&ctxElem, params[0], params[1])
}

brokerURL := tb.queryOwnerOfEntity(ctxElem.Entity.ID)

if brokerURL == tb.myProfile.MyURL {
tb.UpdateContext2LocalSite(&ctxElem, w)
} else {
tb.UpdateContext2RemoteSite(&ctxElem, updateCtxReq.UpdateAction, brokerURL)
}
}

```

Click here to show extra information the analyzer produced.

```
The following paths through the callgraph could lead to a goroutine:
(UpdateContext2LocalSite, 2)
(UpdateContext2LocalSite, 2) -> (notifySubscribers, 2)
(UpdateContext2LocalSite, 2) -> (notifySubscribersV2, 2)
(UpdateContext2LocalSite, 2) -> (notifySubscribers, 2) -> (sendNotify, 4)

```

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: 5f80356f216c2d7d1608c36fd0ea1d18104d4ec9