Fix clippy warnings

[Luni-4]

This PR fixes new clippy warnings

[codecov-commenter]

Codecov Report

Merging #688 (112fc25) into master (3c3c306) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #688      +/-   ##
==========================================
- Coverage   36.98%   36.96%   -0.03%     
==========================================
  Files          49       49              
  Lines        6268     6266       -2     
  Branches      933      933              
==========================================
- Hits         2318     2316       -2     
  Misses       3309     3309              
  Partials      641      641              

Impacted Files	Coverage Δ
src/metrics/exit.rs	76.74% <100.00%> (-0.27%)	⬇️
rust-code-analysis-web/src/web/server.rs	60.54% <0.00%> (-0.10%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3c3c306...112fc25. Read the comment docs.