ghetzel/qcat: client.go; 25 LoC

Found a possible issue in [ghetzel/qcat](https://www.github.com/ghetzel/qcat) at [client.go](https://github.com/ghetzel/qcat/blob/4d691c2458928974b5d0906a942d73b13ceb457e/client.go#L381-L405)

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 delivery was used in a composite literal at line 392

[Click here to see the code in its original context.](https://github.com/ghetzel/qcat/blob/4d691c2458928974b5d0906a942d73b13ceb457e/client.go#L381-L405)

Click here to show the 25 line(s) of Go which triggered the analyzer.

```go
for delivery := range msgs {
var deliveryMode DeliveryMode

switch delivery.DeliveryMode {
case 2:
deliveryMode = Persistent
default:
deliveryMode = Transient
}

self.outchan <- &Message{
delivery: &delivery,
channel: self.channel,
ackRequired: !self.AutoAck,
Timestamp: delivery.Timestamp,
Body: delivery.Body,
Header: MessageHeader{
ContentType: delivery.ContentType,
ContentEncoding: delivery.ContentEncoding,
DeliveryMode: deliveryMode,
Priority: int(delivery.Priority),
Headers: typeutil.MapNative(delivery.Headers),
},
}
}

```

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commit ID: 4d691c2458928974b5d0906a942d73b13ceb457e