mm-compaction-cleanup-isolate_freepages-fix

mm-compaction-cleanup-isolate_freepages-fix

comment fixes, per Minchan

Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dongjun Shin <d.j.shin@samsung.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Sunghwan Yun <sunghwan.yun@samsung.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>