slab: Rename list3/l3 to node

The list3 or l3 pointers are pointing to per node structures. Reflect
that in the names of variables used.
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

mm/slab.h

@@ -16,7 +16,7 @@ enum slab_state {
 	DOWN,			/* No slab functionality yet */
 	PARTIAL,		/* SLUB: kmem_cache_node available */
 	PARTIAL_ARRAYCACHE,	/* SLAB: kmalloc size for arraycache available */
-	PARTIAL_L3,		/* SLAB: kmalloc size for l3 struct available */
+	PARTIAL_NODE,		/* SLAB: kmalloc size for node struct available */
 	UP,			/* Slab caches usable but not all extras yet */
 	FULL			/* Everything is working */
 };