message: Refine face_mat condition.
diff: @@ -671,7 +671,7 @@ void FABilinearFormExtension::Assemble()
  h_I[ndofs] = nnz;
  mat.GetMemoryJ().New(nnz, mat.GetMemoryJ().GetMemoryType());
  mat.GetMemoryData().New(nnz, mat.GetMemoryData().GetMemoryType());
  - if (use_face_mat)
  + if (use_face_mat && restF)
  {
  auto h_I_face = face_mat.HostReadWriteI();
  int cpt = 0;
  @@ -700,7 +700,7 @@ void FABilinearFormExtension::Assemble()
  I[i] = I[i-1];
  }
  I[0] = 0;
  - if (use_face_mat)
  + if (use_face_mat && restF)
  {
  auto I_face = face_mat.HostReadWriteI();
  for (int i = ndofs; i > 0; i--)
  