[Perl/perl5] 4978b8: locale.c: Silence compiler warning

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 4978b81a64bb496bf4e0459e88986f7349d2acaf
      
https://github.com/Perl/perl5/commit/4978b81a64bb496bf4e0459e88986f7349d2acaf
  Author: Karl Williamson <k...@cpan.org>
  Date:   2024-02-05 (Mon, 05 Feb 2024)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Silence compiler warning

This initializes a variable that always gets set before use anyway, but
some compilers don't analyze the code properly and raise a warning.  So
initialize it to silence them.