Merge pull request #57366 from hzxuzhonghu/cacher-fix

Automatic merge from submit-queue (batch tested with PRs 57366, 57779). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Cacher stopLock should be unlocked

**What this PR does / why we need it**:

Cacher.Stop should also unlock stopLock when isStopped. 
Lock & Unlock should be paired in any case.

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

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

staging/src/k8s.io/apiserver/pkg/storage/cacher.go

@@ -655,7 +655,7 @@ func (c *Cacher) Stop() {
 	}
 	c.stopLock.Lock()
 	if c.stopped {
-		// avoid that it was locked meanwhile as isStopped only read-locks
+		c.stopLock.Unlock()
 		return
 	}
 	c.stopped = true
@@ -676,7 +676,7 @@ func forgetWatcher(c *Cacher, index int, triggerValue string, triggerSupported b
 			glog.V(1).Infof("Forcing watcher close due to unresponsiveness: %v", c.objectType.String())
 		}
 		// It's possible that the watcher is already not in the structure (e.g. in case of
-		// simulaneous Stop() and terminateAllWatchers(), but it doesn't break anything.
+		// simultaneous Stop() and terminateAllWatchers(), but it doesn't break anything.
 		c.watchers.deleteWatcher(index, triggerValue, triggerSupported)
 	}
 }
@@ -747,7 +747,7 @@ func (lw *cacherListerWatcher) Watch(options metav1.ListOptions) (watch.Interfac
 	return lw.storage.WatchList(context.TODO(), lw.resourcePrefix, options.ResourceVersion, Everything)
 }
 
-// cacherWatch implements watch.Interface to return a single error
+// errWatcher implements watch.Interface to return a single error
 type errWatcher struct {
 	result chan watch.Event
 }
@@ -787,7 +787,7 @@ func (c *errWatcher) Stop() {
 	// no-op
 }
 
-// cacherWatch implements watch.Interface
+// cachWatcher implements watch.Interface
 type cacheWatcher struct {
 	sync.Mutex
 	input   chan *watchCacheEvent