Merge pull request #23660 from goltermann/vetclean

Automatic merge from submit-queue

Additional go vet fixes

Mostly:
- pass lock by value
- bad syntax for struct tag value
- example functions not formatted properly

pkg/client/unversioned/testclient/fixture.go

@@ -97,8 +97,6 @@ func ObjectReaction(o ObjectRetriever, mapper meta.RESTMapper) ReactionFunc {
 		default:
 			return false, nil, fmt.Errorf("no reaction implemented for %s", action)
 		}
-
-		return true, nil, nil
 	}
 }