[parrot/parrot] 25443f: Use a proper NULL, not 0

[noreply at github.com]

  Branch: refs/heads/master
  Home:   https://github.com/parrot/parrot

  Commit: 25443f29e4182e3e5d34bdb8b922dbfb11ab5ea8
      https://github.com/parrot/parrot/commit/25443f29e4182e3e5d34bdb8b922dbfb11ab5ea8
  Author: Andy Lester <andy at petdance.com>
  Date:   2011-11-16 (Wed, 16 Nov 2011)

  Changed paths:
    M src/scheduler.c

  Log Message:
  -----------
  Use a proper NULL, not 0