dm-snap-persistent: chunk_io doesn't call destroy_work_on_stack in 3.10.76

[Akira Hayakawa <ruby.wktk@xxxxxxxxx>]

Hi,

I am looking at 3.10.76 kernel and found that
chunk_io function of dm-snap-persistent doesn't call
destroy_work_on_stack to pair with INIT_WORK_ON_STACK.

        INIT_WORK_ONSTACK(&req.work, do_metadata);
        queue_work(ps->metadata_wq, &req.work);
        flush_workqueue(ps->metadata_wq);
        // I think you need it here
 
        return req.result;

Is it not buggy?

- Akira

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