rtmutex: Fix a PI crash for deadline tasks

On Tue, Apr 12, 2016 at 11:08:04AM +0800, Xunlei Pang wrote:
> I spotted another issue, we access pi_task without any lock in 
> enqueue_task_dl(),


OK, so I'm on the road and entirely jetlagged, but how can
enqueue_task_dl() not have rq->lock held?

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