message: fix botched pre-push merge. ref
diff: @@ -308,8 +308,9 @@ signed_block chain_controller::_generate_block(
  vector<pending_transaction> pending;
  std::set<transaction_id_type> invalid_pending;
  - pending.reserve(generated.size() + _pending_transactions.size());
  - for (const auto& gt: generated) {
  + pending.reserve(std::distance(generated.first, generated.second) + _pending_transactions.size());
  + for (auto iter = generated.first; iter != generated.second; ++iter) {
  + const auto& gt = *iter;
  pending.emplace_back(std::reference_wrapper<const GeneratedTransaction> {gt.trx});
  }
  