[PATCH] Fix drm 'debug' sysfs permissions

Please consider for next 2.6.13, it is a minor security issue allowing
users to turn on drm debugging when they shouldn't...

This fell through the cracks. Until Josh pointed me at
http://bugs.gentoo.org/show_bug.cgi?id=107893



Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>