[Perl/perl5] 52bccf: regcomp_internal.h: Fix leak in regex tests

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 52bccf632810b58fa7086ef36a1a71d732c5549c
      
https://github.com/Perl/perl5/commit/52bccf632810b58fa7086ef36a1a71d732c5549c
  Author: Karl Williamson <k...@cpan.org>
  Date:   2023-01-12 (Thu, 12 Jan 2023)

  Changed paths:
    M regcomp_internal.h

  Log Message:
  -----------
  regcomp_internal.h: Fix leak in regex tests

Commit fe5492d916201ce31a107839a36bcb1435fe7bf0 introduced leaks when a
regex compilation fails.  This commit uses the standard method we have
to deal with these kinds of things.