improve: reduce function calling number

Signed-off-by: lowang_bh <[email protected]>

Author: lowang-bh

pkg/controller/statefulset/stateful_set_control.go

@@ -348,8 +348,9 @@ func (ssc *defaultStatefulSetControl) updateStatefulSet(
 	}
 
 	// for any empty indices in the sequence [0,set.Spec.Replicas) create a new Pod at the correct revision
-	for ord := getStartOrdinal(set); ord <= getEndOrdinal(set); ord++ {
-		replicaIdx := ord - getStartOrdinal(set)
+	start, end := getStartOrdinal(set), getEndOrdinal(set)
+	for ord := start; ord <= end; ord++ {
+		replicaIdx := ord - start
 		if replicas[replicaIdx] == nil {
 			replicas[replicaIdx] = newVersionedStatefulSetPod(
 				currentSet,