fix(virtio): clippy::new_without_default

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 68.11%. Comparing base (9477c76) to head (4412a5f).

Files	Patch %	Lines
src/virtio.rs	0.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #687 +/- ## ========================================== - Coverage 68.19% 68.11% -0.09% ========================================== Files 20 20 Lines 2305 2308 +3 ========================================== Hits 1572 1572 - Misses 733 736 +3 ```

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