message: Initializing member data to avoid segfault in d'tor
diff: @@ -1120,7 +1120,7 @@ FiniteElementSpace::RefinementOperator::RefinementOperator
  FiniteElementSpace::RefinementOperator::RefinementOperator(
  const FiniteElementSpace *fespace, const FiniteElementSpace *coarse_fes)
  : Operator(fespace->GetVSize(), coarse_fes->GetVSize()),
  - fespace(fespace), old_elem_dof(NULL)
  + fespace(fespace), old_elem_dof(NULL), old_elem_fos(NULL)
  {
  Mesh::GeometryList elem_geoms(*fespace->GetMesh());
  