Merge pull request kubernetes#129434 from xigang/crd_handler

refactor: simplify boolean expressions in CRD handler

Author: k8s-ci-robot

staging/src/k8s.io/apiextensions-apiserver/pkg/apiserver/customresource_handler.go

@@ -660,13 +660,13 @@ func (r *crdHandler) getOrCreateServingInfoFor(uid types.UID, name string) (*crd
 			return nil, fmt.Errorf("failed converting CRD validation to internal version: %v", err)
 		}
 		s, err := structuralschema.NewStructural(internalValidation.OpenAPIV3Schema)
-		if crd.Spec.PreserveUnknownFields == false && err != nil {
+		if !crd.Spec.PreserveUnknownFields && err != nil {
 			// This should never happen. If it does, it is a programming error.
 			utilruntime.HandleError(fmt.Errorf("failed to convert schema to structural: %v", err))
 			return nil, fmt.Errorf("the server could not properly serve the CR schema") // validation should avoid this
 		}
 
-		if crd.Spec.PreserveUnknownFields == false {
+		if !crd.Spec.PreserveUnknownFields {
 			// we don't own s completely, e.g. defaults are not deep-copied. So better make a copy here.
 			s = s.DeepCopy()