Exclusive waiters sleeping with LK_SLEEPFAIL on and using interruptible

sleeps/timeout may have left spourious lk_exslpfail counts on, so clean
it up even when accessing a shared queue acquisition, giving to
lk_exslpfail the value of 'upper limit'.
In the worst case scenario, infact (mixed
interruptible sleep / LK_SLEEPFAIL waiters) what may happen is that both
queues are awaken even if that's not necessary, but still no harm.

Reported by:	Lucius Windschuh <lwindschuh at googlemail dot com>
Reviewed by:	kib
Tested by:	pho, Lucius Windschuh <lwindschuh at googlemail dot com>

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