[Perl/perl5] 90483e: pp_ctl.c: Tighten scope of mutex being locked.

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 90483ee5ba0858ac3f0e5fd6e39ccc3202001749
      
https://github.com/Perl/perl5/commit/90483ee5ba0858ac3f0e5fd6e39ccc3202001749
  Author: Karl Williamson <k...@cpan.org>
  Date:   2023-02-10 (Fri, 10 Feb 2023)

  Changed paths:
    M pp_ctl.c

  Log Message:
  -----------
  pp_ctl.c: Tighten scope of mutex being locked.

Now that snprintf properly handles locales (commit
a683fa5b7e816ae5c10d246c9a0b1f3ea743274b), the call to it here doesn't
have to be locked, so the scope of the remaining mutex lock can be made
smaller.