Fix signedness warnings in tests

[forGGe]

Following warnings prevent me from compiling lib with -Werror:

relative_test.c: In function ‘relative_check’:
relative_test.c:18:17: error: comparison of integer expressions of different signedness: ‘int’ and ‘long unsigned int’ [-Werror=sign-compare]
   18 |   for (i = 0; i < ARRAY_SIZE(relative_paths); ++i) {
      |                 ^
relative_test.c:24:17: error: comparison of integer expressions of different signedness: ‘int’ and ‘long unsigned int’ [-Werror=sign-compare]
   24 |   for (i = 0; i < ARRAY_SIZE(absolute_paths); ++i) {

[codecov-io]

Codecov Report

Merging #3 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #3   +/-   ##
=======================================
  Coverage   97.99%   97.99%           
=======================================
  Files           1        1           
  Lines         448      448           
=======================================
  Hits          439      439           
  Misses          9        9

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[likle]

@forGGe, thanks a lot for contributing!

[forGGe]

You're welcome!