HP6xx patch 2 (__irq_demux)

[Kristoffer E. <kri...@ho...>]

* This replaces 'return __irq_demux(irq)' with 'return irq'. The fix doesnt 
change anything since that is what __irq_demux used to do, but takes away 
the compile error.

signed-off-by: Kristoffer Ericson <Kri...@ho...>

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