removed unused variable from Marker

src/amdis/Marker.inc.hpp

@@ -284,7 +284,6 @@ Flag GridFunctionMarker<Grid, PreGridFct>::markGrid(AdaptInfo& adaptInfo)
     int currentLevel = e.level();
     auto geo = e.geometry();
     auto const& ref = Dune::referenceElement(geo);
-    int codim = ref.dimension;
 
     // evaluate in the center of the element
     int targetLevel = int(std::round(localFct(ref.position(0,0))));