message: Fix debug panic on download with redirect body.
diff: @@ -1006,7 +1006,7 @@ impl<'a, 'cfg> Downloads<'a, 'cfg> {
  let dl = &self.pending[&token].0;
  dl.total.set(total);
  let now = Instant::now();
  - if cur != dl.current.get() {
  + if cur > dl.current.get() {
  let delta = cur - dl.current.get();
  let threshold = self.next_speed_check_bytes_threshold.get();
  