dmabuf: Mark up onstack timer for selftests

The dma-fence selftest uses an on-stack timer that requires explicit
annotation for debugobjects.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111442
Signed-off-by: Chris Wilson <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Acked-by: Daniel Vetter <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/dma-buf/st-dma-fence.c

···
 	struct wait_timer wt;
 	int err = -EINVAL;
 
-	timer_setup(&wt.timer, wait_timer, 0);
+	timer_setup_on_stack(&wt.timer, wait_timer, 0);
 
 	wt.f = mock_fence();
 	if (!wt.f)
···
 	err = 0;
 err_free:
 	del_timer_sync(&wt.timer);
+	destroy_timer_on_stack(&wt.timer);
 	dma_fence_signal(wt.f);
 	dma_fence_put(wt.f);
 	return err;