message: Apply suggestions from code review
  A few simplifications.
diff: @@ -1054,9 +1054,9 @@ ParSesquilinearForm::FormLinearSystem(const Array<int> &ess_tdof_list,
  // with standard essential BC treatment
  if ( A_i.Type() == Operator::Hypre_ParCSR )
  {
  - HypreParMatrix * Ah; A_i.Get(Ah);
  - hypre_ParCSRMatrix * Aih =
  - (hypre_ParCSRMatrix *)const_cast<HypreParMatrix&>(*Ah);
  + HypreParMatrix * Ah;
  + A_i.Get(Ah);
  + hypre_ParCSRMatrix *Aih = *Ah;
  for (int k = 0; k < n; k++)
  {
  int j = ess_tdof_list[k];
  @@ -1128,9 +1128,9 @@ ParSesquilinearForm::FormSystemMatrix(const Array<int> &ess_tdof_list,
  if ( A_i.Type() == Operator::Hypre_ParCSR )
  {
  int n = ess_tdof_list.Size();
  - HypreParMatrix * Ah; A_i.Get(Ah);
  - hypre_ParCSRMatrix * Aih =
  - (hypre_ParCSRMatrix *)const_cast<HypreParMatrix&>(*Ah);
  + HypreParMatrix * Ah;
  + A_i.Get(Ah);
  + hypre_ParCSRMatrix * Aih = *Ah;
  for (int k = 0; k < n; k++)
  {
  int j = ess_tdof_list[k];
  