message: Make GetInputUTXO safer: verify non-witness UTXO match
diff: @@ -59,12 +59,15 @@ bool PartiallySignedTransaction::AddOutput(const CTxOut& txout, const PSBTOutput
  bool PartiallySignedTransaction::GetInputUTXO(CTxOut& utxo, int input_index) const
  {
  - PSBTInput input = inputs[input_index];
  + const PSBTInput& input = inputs[input_index];
  uint32_t prevout_index = tx->vin[input_index].prevout.n;
  if (input.non_witness_utxo) {
  if (prevout_index >= input.non_witness_utxo->vout.size()) {
  return false;
  }
  + if (input.non_witness_utxo->GetHash() != tx->vin[input_index].prevout.hash) {
  + return false;
  + }
  utxo = input.non_witness_utxo->vout[prevout_index];
  } else if (!input.witness_utxo.IsNull()) {
  utxo = input.witness_utxo;
  