fix panic of xsetspec.replicas nil pointer

Author: ColdsteelRail

resourcecontexts/resource_context.go

@@ -27,6 +27,7 @@ import (
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/client-go/tools/record"
+	"k8s.io/utils/ptr"
 	clientutil "kusionstack.io/kube-utils/client"
 	"kusionstack.io/kube-utils/controller/expectations"
 	"kusionstack.io/kube-utils/controller/mixin"
@@ -160,7 +161,7 @@ func (r *RealResourceContextControl) CleanUnusedIDs(ctx context.Context, xsetObj
 			ownedIDs[detail.ID] = detail
 		}
 	}
-	needCleanCount = len(ownedIDs) - maxInt(int(*xsetSpec.Replicas), len(objs))
+	needCleanCount = len(ownedIDs) - maxInt(int(ptr.Deref(xsetSpec.Replicas, 0)), len(objs))
 
 	if needCleanCount <= 0 {
 		return nil

synccontrols/sync_control.go

@@ -180,7 +180,7 @@ func (r *RealSyncControl) SyncTargets(ctx context.Context, instance api.XSetObje
 		syncContext.OwnedIds = ownedIDs
 		return err
 	}); err != nil {
-		return false, fmt.Errorf("fail to allocate %d IDs using context when sync Targets: %w", xspec.Replicas, err)
+		return false, fmt.Errorf("fail to allocate %d IDs using context when sync Targets: %w", ptr.Deref(xspec.Replicas, 0), err)
 	}
 
 	// stateless case