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fix build failure, missing definition of NULL.

/*
  File: acl_valid.c

  Copyright (C) 1999, 2000
  Andreas Gruenbacher, <a.gruenbacher@computer.org>

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Library General Public License for more details.

  You should have received a copy of the GNU Library General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <errno.h>
#include <stdio.h>
#include <acl/libacl.h>


/* 23.4.28 */
int
acl_valid(
	acl_t acl)
{
	int result;

	result = acl_check(acl, NULL);
	if (result != 0) {
		if (result > 0)
			errno = EINVAL;
		return -1;
	}
	return 0;
}