aio: check return value of create_workqueue()

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/aio.c b/fs/aio.c
index 5e00f15..fc557a3 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -87,7 +87,7 @@
 
 	aio_wq = create_workqueue("aio");
 	abe_pool = mempool_create_kmalloc_pool(1, sizeof(struct aio_batch_entry));
-	BUG_ON(!abe_pool);
+	BUG_ON(!aio_wq || !abe_pool);
 
 	pr_debug("aio_setup: sizeof(struct page) = %d\n", (int)sizeof(struct page));