slub: Use the objsize from the kmem_cache_cpu structure

No need to access the kmem_cache structure. We have the same value
in kmem_cache_cpu.
Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Christoph Lameter <clameter@sgi.com>

mm/slub.c

@@ -1681,8 +1681,8 @@ static __always_inline void slab_free(struct kmem_cache *s,
 	unsigned long flags;
 
 	local_irq_save(flags);
-	debug_check_no_locks_freed(object, s->objsize);
 	c = get_cpu_slab(s, smp_processor_id());
+	debug_check_no_locks_freed(object, c->objsize);
 	if (likely(page == c->page && c->node >= 0)) {
 		object[c->offset] = c->freelist;
 		c->freelist = object;