avoid ticker leak

unmaintained/stress_filer_upload/bench_filer_upload/bench_filer_upload.go

@@ -66,6 +66,7 @@ func main() {
 
 	go func() {
 		ticker := time.NewTicker(1000 * time.Millisecond)
+		defer ticker.Stop()
 
 		var lastTime time.Time
 		var counter, size int64

unmaintained/stress_filer_upload/stress_filer_upload_actual/stress_filer_upload.go

@@ -72,6 +72,7 @@ func main() {
 
 	go func() {
 		ticker := time.NewTicker(500 * time.Millisecond)
+		defer ticker.Stop()
 
 		var lastTime time.Time
 		var counter, size int64