message: bls12_381: Remove unnecessary unit return values
diff: @@ -311,15 +311,9 @@ impl From<G2Affine> for G2Prepared {
  let coeffs = addition_step(&mut self.cur, &self.base);
  self.coeffs.push(coeffs);
  }
  - fn square_output(_: Self::Output) -> Self::Output {
  - ()
  - }
  - fn conjugate(_: Self::Output) -> Self::Output {
  - ()
  - }
  - fn one() -> Self::Output {
  - ()
  - }
  + fn square_output(_: Self::Output) -> Self::Output {}
  + fn conjugate(_: Self::Output) -> Self::Output {}
  + fn one() -> Self::Output {}
  }
  let is_identity = q.is_identity();
  