message: fix: Block number used to calculate g2
diff: @@ -112,7 +112,7 @@ impl<'a, CS: ChainStore> DaoCalculator<'a, CS, DataLoaderWrapper<CS>> {
  .and_then(|index| self.store.get_epoch_ext(&index))
  .ok_or(Error::InvalidHeader)?;
  let parent_g2 = calculate_g2(
  - parent.number(),
  + target.number(),
  &target_epoch,
  self.consensus.secondary_epoch_reward(),
  )?;
  