dequeue_huge_page() warning fix

mm/hugetlb.c: In function `dequeue_huge_page':
mm/hugetlb.c:72: warning: 'nid' might be used uninitialized in this function

Cc: Christoph Lameter <clameter@sgi.com>
Cc: Adam Litke <agl@us.ibm.com>
Cc: David Gibson <hermes@gibson.dropbear.id.au>
Cc: William Lee Irwin III <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/hugetlb.c

@@ -78,17 +78,14 @@ static struct page *dequeue_huge_page(struct vm_area_struct *vma,
 	for (z = zonelist->zones; *z; z++) {
 		nid = zone_to_nid(*z);
 		if (cpuset_zone_allowed_softwall(*z, htlb_alloc_mask) &&
-		    !list_empty(&hugepage_freelists[nid]))
-			break;
-	}
-
-	if (*z) {
+		    !list_empty(&hugepage_freelists[nid])) {
 			page = list_entry(hugepage_freelists[nid].next,
 					  struct page, lru);
 			list_del(&page->lru);
 			free_huge_pages--;
 			free_huge_pages_node[nid]--;
 		}
+	}
 	return page;
 }