Fix clippy warnings

[Luni-4]

This PR fixes clippy warnings introduced by Rust 1.63

[codecov-commenter]

Codecov Report

Merging #913 (5636563) into master (c7e1fb4) will not change coverage.
The diff coverage is 91.66%.

@@           Coverage Diff           @@
##           master     #913   +/-   ##
=======================================
  Coverage   68.55%   68.55%           
=======================================
  Files          60       60           
  Lines       12297    12297           
=======================================
  Hits         8430     8430           
  Misses       3867     3867           

Impacted Files	Coverage Δ
src/languages/language_preproc.rs	0.00% <0.00%> (ø)
src/languages/language_ccomment.rs	100.00% <100.00%> (ø)
src/languages/language_cpp.rs	3.76% <100.00%> (ø)
src/languages/language_java.rs	3.49% <100.00%> (ø)
src/languages/language_javascript.rs	8.46% <100.00%> (ø)
src/languages/language_mozjs.rs	8.42% <100.00%> (-0.39%)	⬇️
src/languages/language_python.rs	7.05% <100.00%> (ø)
src/languages/language_rust.rs	6.06% <100.00%> (ø)
src/languages/language_tsx.rs	6.08% <100.00%> (ø)
src/languages/language_typescript.rs	6.26% <100.00%> (ø)
... and 4 more

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[marco-c]

Thanks!