[Perl/perl5] 9553b2: locale.c: Avoid an infinite loop

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 9553b2f989a7e9d5b8f2f6c6ded9174023d784eb
      
https://github.com/Perl/perl5/commit/9553b2f989a7e9d5b8f2f6c6ded9174023d784eb
  Author: Karl Williamson <k...@cpan.org>
  Date:   2023-10-20 (Fri, 20 Oct 2023)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Avoid an infinite loop

This was doing a 'continue' under some rare Configurations before doing
an increment.  No test because it's really hard to get such a
Configuration in the wild.