fixed LimitedRunner behavior if runnable panics

limited_runner.go

@@ -22,7 +22,7 @@ func NewLimitedRunner(routineLimit int) *LimitedRunner {
 func (r *LimitedRunner) Run(f func()) {
 	r.limiter <- struct{}{}
 	go func() {
+		defer func() { <-r.limiter }()
 		f()
-		<-r.limiter
 	}()
 }