clippy: Fix clippy warning.

[hanbings]

I'm sorry that I wrote some redundant code at #353 and #342 which caused cargo clippy --all-targets --all-features to generate multiple warnings.

Fix them in this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.58%. Comparing base (6a83795) to head (acd5c4b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #357      +/-   ##
==========================================
- Coverage   59.35%   58.58%   -0.78%     
==========================================
  Files          30       30              
  Lines        3831     3815      -16     
  Branches      872      859      -13     
==========================================
- Hits         2274     2235      -39     
- Misses       1218     1257      +39     
+ Partials      339      323      -16     

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[cakebaker]

No need to be sorry :) I added --all-targets to the CI in #359, so in the future the CI should catch such issues.

Thanks for fixing the issues!