delete po and callbackstate in case of jsInstanceInfo == nullptr

Author: FrancisDuvivierTHEO

test-app/runtime/src/main/cpp/ObjectManager.cpp

@@ -325,6 +325,8 @@ void ObjectManager::JSObjectFinalizer(Isolate *isolate, ObjectWeakCallbackState
 
     if (jsInstanceInfo == nullptr) {
         po->Reset();
+        delete po;
+        delete callbackState;
         return;
     }