Fix golangci-lint errors (#10196)

* Fix golangci-lint errors

Signed-off-by: z1cheng <imchench@gmail.com>

* Fix dupl errors

Signed-off-by: z1cheng <imchench@gmail.com>

* Fix comments

Signed-off-by: z1cheng <imchench@gmail.com>

* Fix errcheck lint errors

Signed-off-by: z1cheng <imchench@gmail.com>

* Fix assert in e2e test

Signed-off-by: z1cheng <imchench@gmail.com>

* Not interrupt the waitForPodsReady

Signed-off-by: z1cheng <imchench@gmail.com>

* Replace string with constant

Signed-off-by: z1cheng <imchench@gmail.com>

* Fix comments

Signed-off-by: z1cheng <imchench@gmail.com>

* Revert write file permision

Signed-off-by: z1cheng <imchench@gmail.com>

---------

Signed-off-by: z1cheng <imchench@gmail.com>

internal/ingress/controller/store/endpointslice.go

@@ -38,7 +38,7 @@ func (s *EndpointSliceLister) MatchByKey(key string) ([]*discoveryv1.EndpointSli
 		keyNsLen = 0
 	} else {
 		// count '/' char
-		keyNsLen += 1
+		keyNsLen++
 	}
 	// filter endpointSlices owned by svc
 	for _, listKey := range s.ListKeys() {