5589 improper use of NULL in tools/ctf
Reviewed by: David Höppner <0xffea@gmail.com>
Reviewed by: Josef "Jeff" Sipek <jeffpc@josefsipek.net>
Approved by: Dan McDonald <danmcd@omniti.com>
Author: Richard PALO <richard@NetBSD.org>

illumos/illumos-gate@ad0b1ea5d69a45fe23c434277599e315f29a5fca