mm: remove unncessary ret in page_referenced

mm: remove unncessary ret in page_referenced

Nobody uses ret variable. Remove it.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Minchan Kim <[email protected]>
Acked-by: Hillf Danton <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>