mm/mempolicy.c: quiet sparse noise

Quiet the spares noise:

warning: symbol 'default_policy' was not declared. Should it be static?
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Stephen Wilson <wilsons@start.ca>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/mempolicy.c

@@ -111,7 +111,7 @@ enum zone_type policy_zone = 0;
 /*
  * run-time system-wide default policy => local allocation
  */
-struct mempolicy default_policy = {
+static struct mempolicy default_policy = {
 	.refcnt = ATOMIC_INIT(1), /* never free it */
 	.mode = MPOL_PREFERRED,
 	.flags = MPOL_F_LOCAL,