Upon updating my drm-next branch to the latest -CURRENT callout_drain returning 
no longer means that the function was in fact pending when it was called.

This little bit of code will panic because dwork->wq is NULL, because the 
callout was _not_ in fact enqueued. So either it's no longer possible to 
reliably query if a callout was pending while clearing it and we're ok with 
that or glebius last commit needs some further re-work.

#define del_timer_sync(timer)   (callout_drain(&(timer)->timer_callout) == 1)

static inline bool
flush_delayed_work(struct delayed_work *dwork)

        if (del_timer_sync(&dwork->timer))
                linux_queue_work(dwork->cpu, dwork->wq, &dwork->work);
        return (flush_work(&dwork->work));

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