apparmor: fix quiet_denied for file rules

commit 68ff8540 upstream.

Global quieting of denied AppArmor generated file events is not
handled correctly. Unfortunately the is checking if quieting of all
audit events is set instead of just denied events.

Fixes: 67012e82 ("AppArmor: basic auditing infrastructure.")
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>