fix clippy warnings/errors

[codecov[bot]]

Codecov Report

Patch coverage: 58.42% and project coverage change: -0.03% :warning:

Comparison is base (ca71ff8) 92.74% compared to head (7ae90eb) 92.71%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #58 +/- ## ========================================== - Coverage 92.74% 92.71% -0.03% ========================================== Files 49 49 Lines 52341 52312 -29 ========================================== - Hits 48542 48500 -42 - Misses 3799 3812 +13 ``` | [Files Changed](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah) | Coverage Δ | | |---|---|---| | [faer-cholesky/src/lib.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1jaG9sZXNreS9zcmMvbGliLnJz) | `0.00% <ø> (ø)` | | | [faer-core/src/permutation.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1jb3JlL3NyYy9wZXJtdXRhdGlvbi5ycw==) | `79.72% <ø> (-0.28%)` | :arrow_down: | | [faer-core/src/zip.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1jb3JlL3NyYy96aXAucnM=) | `95.62% <ø> (ø)` | | | [faer-evd/src/lib.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1ldmQvc3JjL2xpYi5ycw==) | `93.70% <ø> (ø)` | | | [faer-qr/src/lib.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1xci9zcmMvbGliLnJz) | `100.00% <ø> (ø)` | | | [faer-svd/src/lib.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1zdmQvc3JjL2xpYi5ycw==) | `99.04% <ø> (ø)` | | | [faer-core/src/mul.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1jb3JlL3NyYy9tdWwucnM=) | `76.60% <20.58%> (-0.51%)` | :arrow_down: | | [faer-evd/src/tridiag.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1ldmQvc3JjL3RyaWRpYWcucnM=) | `92.23% <42.85%> (-0.01%)` | :arrow_down: | | [faer-core/src/lib.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1jb3JlL3NyYy9saWIucnM=) | `76.77% <44.44%> (-0.11%)` | :arrow_down: | | [faer-evd/src/hessenberg\_real\_evd.rs](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/58?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah#diff-ZmFlci1ldmQvc3JjL2hlc3NlbmJlcmdfcmVhbF9ldmQucnM=) | `93.79% <55.02%> (+0.15%)` | :arrow_up: | | ... and [9 more](https://app.codecov.io/gh/sarah-ek/faer-rs/pull/58?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sarah) | |

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