Fix warning that comparison of integers of different signs

[her-cat]

No description provided.

[codecov]

Codecov Report

Merging #140 (77bdd93) into develop (1cfec4f) will increase coverage by 9.92%.
The diff coverage is 100.00%.

❗ Current head 77bdd93 differs from pull request most recent head d38c4ef. Consider uploading reports for the commit d38c4ef to get more accurate results

@@              Coverage Diff              @@
##             develop     #140      +/-   ##
=============================================
+ Coverage      56.78%   66.70%   +9.92%     
=============================================
  Files             91       28      -63     
  Lines           9848     4475    -5373     
=============================================
- Hits            5592     2985    -2607     
+ Misses          4256     1490    -2766     

Impacted Files	Coverage Δ
ext/src/swow_buffer.c	85.38% <100.00%> (-2.63%)	⬇️
ext/src/swow_hook.c	54.16% <0.00%> (-41.29%)	⬇️
ext/src/swow_defer.c	43.90% <0.00%> (-38.19%)	⬇️
ext/src/swow_watchdog.c	48.61% <0.00%> (-32.97%)	⬇️
ext/src/swow_coroutine.c	61.09% <0.00%> (-17.77%)	⬇️
ext/src/swow_event.c	57.89% <0.00%> (-17.58%)	⬇️
ext/src/swow_dns.c	80.55% <0.00%> (-13.20%)	⬇️
ext/src/swow_tokenizer.c	28.63% <0.00%> (-12.20%)	⬇️
ext/src/swow_errno.c	88.88% <0.00%> (-11.12%)	⬇️
ext/src/swow_signal.c	83.33% <0.00%> (-8.67%)	⬇️
... and 82 more

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[twose]

Thank you for your contribution.