[Perl/perl5] 465e0d: pp_hot.c: Avoid DIE in void function S_aassign_uid

[Craig A. Berry]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 465e0d24ea4f5604e99f539540e31381c59ba2e8
      
https://github.com/Perl/perl5/commit/465e0d24ea4f5604e99f539540e31381c59ba2e8
  Author: Craig A. Berry <craigbe...@mac.com>
  Date:   2023-12-31 (Sun, 31 Dec 2023)

  Changed paths:
    M pp_hot.c

  Log Message:
  -----------
  pp_hot.c: Avoid DIE in void function S_aassign_uid

f54903ed18841 moved some code from pp_aassign out to its own
function S_aassign_uid, but the new function is void and DIE
translates to "return Perl_die" which can lead to compiler
warnings about attempting to return a value from a void function.

So just call Perl_die directly without a return statement, which
is already a pretty common practice.