xoreo/mcserver-backend: types/serverdb.go; 18 LoC

Found a possible issue in [xoreo/mcserver-backend](https://www.github.com/xoreo/mcserver-backend) at [types/serverdb.go](https://github.com/xoreo/mcserver-backend/blob/98571d4a4dbc62c5a1c4060f80642d6eb9e509ec/types/serverdb.go#L84-L101)

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.

> reference to currentServer is reassigned at line 88

[Click here to see the code in its original context.](https://github.com/xoreo/mcserver-backend/blob/98571d4a4dbc62c5a1c4060f80642d6eb9e509ec/types/serverdb.go#L84-L101)

Click here to show the 18 line(s) of Go which triggered the analyzer.

```go
for _, currentServer := range db.Servers {
// If hash is used instead of
if hash != "" { // Then oldServer should also be nil. But if it isn't, hash is preferred
if serverMatch(currentServer, hash) {
oldServer = ¤tServer
exists = true
break
}
} else if hash == "" {
// If oldServer is used instead of the old server hash
if currentServer.Hash.String() == oldServer.Hash.String() {
exists = true
break
}
} else {
return errors.New("bad arguments to UpdateServer call")
}
}

```

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commit ID: 98571d4a4dbc62c5a1c4060f80642d6eb9e509ec