intel: properly test for HAS_LLC

If the kernel supports the test, we need to check the param.
Copy&pasta from the above checks that only look at the return value.
Interesting how much one can get such a simple interface wrong.

Issue created in

commit 151cdcfe
Author: Eugeni Dodonov <eugeni.dodonov@intel.com>
Date:   Tue Jan 17 15:20:19 2012 -0200

    intel: query for LLC support

Patch even claims to have fixed this in v2, but is actually unchanged
from v1.

Reported-by: Xiang, Haihao <haihao.xiang@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>