Leboudin/go_distributed_object_storage: provider/server.go; 37 LoC

Found a possible issue in [Leboudin/go_distributed_object_storage](https://www.github.com/Leboudin/go_distributed_object_storage) at [provider/server.go](https://github.com/Leboudin/go_distributed_object_storage/blob/48d0ccbc36bb96af796a9f432e9ba32639fdf567/provider/server.go#L94-L130)

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 r used in defer or goroutine at line 108

[Click here to see the code in its original context.](https://github.com/Leboudin/go_distributed_object_storage/blob/48d0ccbc36bb96af796a9f432e9ba32639fdf567/provider/server.go#L94-L130)

Click here to show the 37 line(s) of Go which triggered the analyzer.

```go
for r := range c {
log.Printf("Consume message %s", *r.Body)
req := make(map[string]string)
err := json.Unmarshal([]byte(*r.Body), &req)
if err != nil {
log.Printf("Failed to unmarshal string to JSON, error: %s", err)
continue
}

log.Printf("Trying to located object %s, request UID: %s", req["name"], req["uid"])
if s.isObjectExists(req["name"]) {
log.Printf("Object %s found", req["name"])
// delete the message
go func() {
err := locateSQS.DeleteMessage(r, locateSQS.Url)
if err != nil {
log.Printf("Failed to delete message %s, error: %s", *r.ReceiptHandle, err)
}
}()

// send reply to godos-test-located queue
go func() {
msg := map[string]string{
"name": req["name"],
"uid": req["uid"],
"addr": s.addr,
}

_, err := locateSQS.SendMessage(msg, locateSQS.ReplyUrl)
if err != nil {
log.Printf("Failed to send reply message, error: %s", err)
}
}()
} else {
log.Printf("Object %s not found", req["name"])
}
}

```

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: 48d0ccbc36bb96af796a9f432e9ba32639fdf567