message: remove non needed parentheses
diff: @@ -621,7 +621,7 @@ pub mod fee {
  if input_value >= (output_value + fee.to_coin()) { break; }
  }
  - if (input_value < (output_value + fee.to_coin())) {
  + if input_value < (output_value + fee.to_coin()) {
  return Err(Error::NotEnoughInput);
  }
  