Fix ThrottleTimer null-pointer error / race condition

throttle_timer.go

@@ -26,7 +26,9 @@ func NewThrottleTimer(name string, dur time.Duration) *ThrottleTimer {
 	var ch = make(chan struct{})
 	var quit = make(chan struct{})
 	var t = &ThrottleTimer{Name: name, Ch: ch, dur: dur, quit: quit}
+	t.mtx.Lock()
 	t.timer = time.AfterFunc(dur, t.fireRoutine)
+	t.mtx.Unlock()
 	t.timer.Stop()
 	return t
 }