message: Use for loop
diff: @@ -472,10 +472,9 @@ impl<'a> ParallelSleepDriver<'a> {
  }
  fn wakeup_soon(&self) -> TockResult<()> {
  - let mut i = 0;
  self.context.active_timer.set(None);
  - loop {
  + for i in 0.. {
  let now = get_current_ticks()?;
  let next_timer = ActiveTimer {
  @@ -491,7 +490,6 @@ impl<'a> ParallelSleepDriver<'a> {
  Ok(_) => (),
  Err(_) => (),
  }
  - i += 1;
  }
  }
  Ok(())
  