Fix assert with point data reader

dune/vtk/vtkreader.hh

@@ -126,7 +126,7 @@ namespace Dune
       auto point_it = pointData_.find("PointData." + name);
       VTK_ASSERT_MSG(data_it != dataArray_.end() && point_it != pointData_.end(),
         "The data to extract is not found in point-data. Try `getCellData()` instead!");
-      VTK_ASSERT(data_it->second.section == CELL_DATA);
+      VTK_ASSERT(data_it->second.section == POINT_DATA);
 
       return {*creator_, point_it->second, data_it->second.components,
               vec_types, vec_offsets, vec_connectivity};