slub statistics: Fix check for DEACTIVATE_REMOTE_FREES

The remote frees are in the freelist of the page and not in the
percpu freelist.

Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
diff --git a/mm/slub.c b/mm/slub.c
index 0863fd3..a96e11c 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1368,7 +1368,7 @@
 	struct page *page = c->page;
 	int tail = 1;
 
-	if (c->freelist)
+	if (page->freelist)
 		stat(c, DEACTIVATE_REMOTE_FREES);
 	/*
 	 * Merge cpu freelist into slab freelist. Typically we get here