Fix a m_camera not used warning fix pointed by clang

src/content_cao.cpp

@@ -546,7 +546,6 @@ GenericCAO::GenericCAO(IGameDef *gamedef, ClientEnvironment *env):
 		//
 		m_smgr(NULL),
 		m_irr(NULL),
-		m_camera(NULL),
 		m_gamedef(NULL),
 		m_selection_box(-BS/3.,-BS/3.,-BS/3., BS/3.,BS/3.,BS/3.),
 		m_meshnode(NULL),

src/content_cao.h

@@ -68,7 +68,6 @@ private:
 	//
 	scene::ISceneManager *m_smgr;
 	IrrlichtDevice *m_irr;
-	Camera* m_camera;
 	IGameDef *m_gamedef;
 	aabb3f m_selection_box;
 	scene::IMeshSceneNode *m_meshnode;