mm: struct shrinker: make flags of unsigned type

Currently, there are two flags only, so unsigned is more then enough.
Also, move int seeks to keep these fields together.

Link: http://lkml.kernel.org/r/153199748720.21131.6476256940113102483.stgit@localhost.localdomain
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/shrinker.h

@@ -63,9 +63,9 @@ struct shrinker {
 	unsigned long (*scan_objects)(struct shrinker *,
 				      struct shrink_control *sc);
 
-	int seeks;	/* seeks to recreate an obj */
 	long batch;	/* reclaim batch size, 0 = default */
-	unsigned long flags;
+	int seeks;	/* seeks to recreate an obj */
+	unsigned flags;
 
 	/* These are for internal use */
 	struct list_head list;