glgsg: Remove unused variable from glGSG

panda/src/glstuff/glGraphicsStateGuardian_src.h

@@ -722,7 +722,6 @@ protected:
   typedef pmap<NodePath, DirectionalLightFrameData> DirectionalLights;
   DirectionalLights _dlights;
 
-  int _pass_number;
   GLuint _geom_display_list;
   GLuint _current_vbuffer_index;
   GLuint _current_ibuffer_index;