install-qa-check.d/90world-writable: fix usage of missing function

Fixes: 6dafdc28897682f7b8c77b7863b5713634974647
Subject: Remove __eqalog & __eqawarnlog
Author: Michał Górny <mgorny@gentoo.org> (Sun 02 Nov 2014 11:16:04 AM PST)

As per Zmedico:
This file also contains an invalid IFS=OLDIFS setting (which should
really be IFS=$OLDIFS).