slub: correct comments error for per cpu partial

Correct comment errors, that mistake cpu partial objects number as pages
number, may make reader misunderstand.

Signed-off-by: Alex Shi <alex.shi@intel.com>
Reviewed-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 4890ef7..a32bcfd 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -82,7 +82,7 @@
 	int size;		/* The size of an object including meta data */
 	int objsize;		/* The size of an object without meta data */
 	int offset;		/* Free pointer offset. */
-	int cpu_partial;	/* Number of per cpu partial pages to keep around */
+	int cpu_partial;	/* Number of per cpu partial objects to keep around */
 	struct kmem_cache_order_objects oo;
 
 	/* Allocation and freeing of slabs */