message: equihash: Clarify order of operations in indices_from_minimal
diff: @@ -213,7 +213,8 @@ fn expand_array(vin: &[u8], bit_len: usize, byte_pad: usize) -> Vec<u8> {
  fn indices_from_minimal(p: Params, minimal: &[u8]) -> Result<Vec<u32>, Error> {
  let c_bit_len = p.collision_bit_length();
  - if minimal.len() != (1 << p.k) * (c_bit_len + 1) / 8 {
  + // Division is exact because k >= 3.
  + if minimal.len() != ((1 << p.k) * (c_bit_len + 1)) / 8 {
  return Err(Error(Kind::InvalidParams));
  }
  