BGE cleanup: KX_GameObject::GetParent() no longer increases the object's refcount.

I'm not sure why this function ever increased the object's refcount. Any
place in the code that calls KX_GameObject::GetParent() has to turn
around and call parent->Release(). Forgetting to call Release() was a
common cause of memory leaks (in fact, KX_SteeringActuator was probably
leaking). If the refcount needs to be increased, the calling code can
handle calling AddRef().

source/gameengine/Ketsji/KX_GameObject.cpp

@@ -306,9 +306,6 @@ KX_GameObject* KX_GameObject::GetParent()
 		if (node)
 			result = (KX_GameObject*)node->GetSGClientObject();
 	}
-	
-	if (result)
-		result->AddRef();
 
 	return result;
 	
@@ -2113,7 +2110,6 @@ PyObject *KX_GameObject::pyattr_get_parent(void *self_v, const KX_PYATTRIBUTE_DE
 	KX_GameObject* self = static_cast<KX_GameObject*>(self_v);
 	KX_GameObject* parent = self->GetParent();
 	if (parent) {
-		parent->Release(); /* self->GetParent() AddRef's */
 		return parent->GetProxy();
 	}
 	Py_RETURN_NONE;