fix a nil pointer ref in slice allocation

Kubernetes-commit: 904d5c45de4e3a5a21eb2eaa648d3ce0b70938ba

pkg/storageversion/manager.go

@@ -112,7 +112,7 @@ func (s *defaultManager) UpdateStorageVersions(kubeAPIServerClientConfig *rest.C
 	sc := clientset.InternalV1alpha1().StorageVersions()
 
 	s.mu.RLock()
-	resources := make([]*ResourceInfo, len(s.managedResourceInfos))
+	resources := []*ResourceInfo{}
 	for resource := range s.managedResourceInfos {
 		resources = append(resources, resource)
 	}