message: Remove manual incref
diff: @@ -104,10 +104,7 @@ impl Handle {
  impl Clone for Handle {
  fn clone(&self) -> Self {
  - h5lock!({
  - self.incref();
  - Self::try_new(self.id()).unwrap_or_else(|_| Self::invalid())
  - })
  + Self::try_borrow(self.id()).unwrap_or_else(|_| Self::invalid())
  }
  }
  