fix shutdown crash if ogre was not initialised yet

libs/openengine/ogre/renderer.cpp

@@ -114,7 +114,7 @@ void OgreRenderer::createWindow(const std::string &title, const WindowSettings&
     // create the semi-transparent black background texture used by the GUI.
     // has to be created in code with TU_DYNAMIC_WRITE_ONLY_DISCARDABLE param
     // so that it can be modified at runtime. 
-    mTransparentBGTexture = Ogre::TextureManager::getSingleton().createManual(
+    Ogre::TextureManager::getSingleton().createManual(
                     "transparent.png",
                     Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,
                     Ogre::TEX_TYPE_2D,

libs/openengine/ogre/renderer.hpp

@@ -74,8 +74,6 @@ namespace OEngine
             Fader* mFader;
             bool logging;
 
-            Ogre::TexturePtr mTransparentBGTexture;
-
         public:
             OgreRenderer()
             : mRoot(NULL)