Merge pull request #46681 from zhangxiaoyu-zidif/format-for-cronjob_controller

Automatic merge from submit-queue (batch tested with PRs 46681, 46786, 46264, 46680, 46805)

Fix for-loop and err definition

**What this PR does / why we need it**:
we can use j directly, it's odd to use i then get j through i.
we can put err definition into if{} , after all the para. was only used in if{}.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

pkg/controller/cronjob/cronjob_controller.go

@@ -205,8 +205,7 @@ func syncOne(sj *batchv2alpha1.CronJob, js []batchv1.Job, now time.Time, jc jobC
 	nameForLog := fmt.Sprintf("%s/%s", sj.Namespace, sj.Name)
 
 	childrenJobs := make(map[types.UID]bool)
-	for i := range js {
-		j := js[i]
+	for _, j := range js {
 		childrenJobs[j.ObjectMeta.UID] = true
 		found := inActiveList(*sj, j.ObjectMeta.UID)
 		if !found && !IsJobFinished(&j) {
@@ -366,11 +365,11 @@ func deleteJob(sj *batchv2alpha1.CronJob, job *batchv1.Job, jc jobControlInterfa
 	// TODO: this should be replaced with server side job deletion
 	// currencontinuetly this mimics JobReaper from pkg/kubectl/stop.go
 	nameForLog := fmt.Sprintf("%s/%s", sj.Namespace, sj.Name)
-	var err error
 
 	// scale job down to 0
 	if *job.Spec.Parallelism != 0 {
 		zero := int32(0)
+		var err error
 		job.Spec.Parallelism = &zero
 		job, err = jc.UpdateJob(job.Namespace, job)
 		if err != nil {