Fix build warnings

[Serial-ATA]

• cfg(fuzzing) no longer trips up unexpected_cfgs
• Remove the check for feature = "total_cmp" since the feature no longer exists

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 61.36%. Comparing base (a74b96d) to head (4ba59bf). Report is 6 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #589 +/- ## ========================================== - Coverage 61.38% 61.36% -0.02% ========================================== Files 533 532 -1 Lines 49711 49714 +3 Branches 12628 12619 -9 ========================================== - Hits 30513 30505 -8 - Misses 9856 9866 +10 - Partials 9342 9343 +1 ```

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