[Perl/perl5] e12fcc: Fix leak when smartmatching against a coderef

[Leon Timmermans via perl5-changes]

  Branch: refs/heads/leont/smartmatch-leak
  Home:   https://github.com/Perl/perl5
  Commit: e12fcc1db6db23705a07fa1afeba83ba77b90a54
      
https://github.com/Perl/perl5/commit/e12fcc1db6db23705a07fa1afeba83ba77b90a54
  Author: Leon Timmermans <faw...@gmail.com>
  Date:   2023-08-30 (Wed, 30 Aug 2023)

  Changed paths:
    M pp_ctl.c
    M t/op/svleak.t

  Log Message:
  -----------
  Fix leak when smartmatching against a coderef

Previously, when smartmatching against a code reference, the return
value would be leaked. This fixes that leak.