fs: dlm: fix return value check in dlm_memory_init()

It should check 'cb_cache', after calling kmem_cache_create("dlm_cb").

Fixes: 61bed0baa4 ("fs: dlm: use a non-static queue for callbacks")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/memory.c

@@ -51,7 +51,7 @@ int __init dlm_memory_init(void)
 	cb_cache = kmem_cache_create("dlm_cb", sizeof(struct dlm_callback),
 				     __alignof__(struct dlm_callback), 0,
 				     NULL);
-	if (!rsb_cache)
+	if (!cb_cache)
 		goto cb;
 
 	return 0;