Core/GameObject: Implement method GetDisplayId, use it for GameObjectModels

src/server/collision/Models/GameObjectModel.cpp

@@ -148,7 +148,7 @@ bool GameObjectModel::initialize(const GameObject& go, const GameObjectDisplayIn
 
 GameObjectModel* GameObjectModel::Create(const GameObject& go)
 {
-    const GameObjectDisplayInfoEntry* info = sGameObjectDisplayInfoStore.LookupEntry(go.GetGOInfo()->displayId);
+    const GameObjectDisplayInfoEntry* info = sGameObjectDisplayInfoStore.LookupEntry(go.GetDisplayId());
     if (!info)
         return NULL;
 

src/server/game/Entities/GameObject/GameObject.h

@@ -802,6 +802,7 @@ class GameObject : public WorldObject, public GridObject<GameObject>
 
         std::string GetAIName() const;
         void SetDisplayId(uint32 displayid);
+        uint32 GetDisplayId() const { return GetUInt32Value(GAMEOBJECT_DISPLAYID); }
 
         GameObjectModel * m_model;
     protected: