rm unnecessary separate var declaration

hub.go

@@ -656,9 +656,8 @@ func (h *subShard) broadcastPublication(channel string, sp StreamPosition, pub,
  // about insufficient state in the stream.
  var maxLagExceeded bool
  now := time.Now()
- var timeLagMilli int64
  if pubTime > 0 {
- timeLagMilli = now.UnixMilli() - pubTime
+ timeLagMilli := now.UnixMilli() - pubTime
  if h.maxTimeLagMilli > 0 && timeLagMilli > h.maxTimeLagMilli {
  maxLagExceeded = true
  }