message: fix clippy else if let redundancy
diff: @@ -40,15 +40,13 @@ impl<F: PrimeField> Display for CairoMemory<F> {
  for i in 1..self.size() {
  // Visualize content of memory excluding the 0th dummy entry
  if let Some(elem) = self[F::from(i)] {
  - if let Err(_) = writeln!(f, "{0:>6}: 0x{1:}", i, elem.get_word().to_hex_le()) {
  + if writeln!(f, "{0:>6}: 0x{1:}", i, elem.get_word().to_hex_le()).is_err() {
  println!("Error while writing")
  }
  - } else {
  - if let Err(_) = writeln!(f, "{0:>6}: None", i) {
  + } else if writeln!(f, "{0:>6}: None", i).is_err() {
  println!("Error while writing")
  }
  }
  - }
  Ok(())
  }
  }
  