Main: SceneManager::_destroySceneNode - fix segfault in error path
Main: SceneManager::_destroySceneNode - fix segfault in error path

thanks @Snild for spotting
OGRECave/ogre,paroj/ogre,paroj/ogre,OGRECave/ogre,OGRECave/ogre,paroj/ogre,paroj/ogre,OGRECave/ogre,OGRECave/ogre,paroj/ogre