message: Fix panic test.
diff: @@ -35,5 +35,5 @@ fn main() {
  // Cleanup: reset to default hook.
  drop(std::panic::take_hook());
  - assert_eq!(HOOK_COUNT.load(Ordering::Relaxed), 8);
  + assert_eq!(HOOK_COUNT.load(Ordering::Relaxed), 6);
  }
  