aio: use cancel_delayed_work_sync()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/aio.c b/fs/aio.c
index 9c3de88..a92d754 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -211,8 +211,7 @@
 	unsigned nr_events = ctx->max_reqs;
 	BUG_ON(ctx->reqs_active);
 
-	cancel_delayed_work(&ctx->wq);
-	cancel_work_sync(&ctx->wq.work);
+	cancel_delayed_work_sync(&ctx->wq);
 	aio_free_ring(ctx);
 	mmdrop(ctx->mm);
 	ctx->mm = NULL;