Merge pull request #38739 from foxyriver/close

Automatic merge from submit-queue

Object r repeat close

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

Object r repeat close. 
each end of the for loop, the object r has been closed. so omitting defer r.close(), to avoid repeat close.

**Special notes for your reviewer**:

**Release note**:

```release-note
```

pkg/genericapiserver/endpoints/watch_test.go

@@ -299,6 +299,7 @@ func TestWatchRead(t *testing.T) {
 
 	for _, protocol := range protocols {
 		for _, test := range testCases {
+			func() {
 				info, ok := runtime.SerializerInfoForMediaType(api.Codecs.SupportedMediaTypes(), test.MediaType)
 				if !ok || info.StreamSerializer == nil {
 					t.Fatal(info)
@@ -359,8 +360,7 @@ func TestWatchRead(t *testing.T) {
 				if err == nil {
 					t.Errorf("Unexpected non-error")
 				}
-
-			r.Close()
+			}()
 		}
 	}
 }