irq: Make sure irq_desc for legacy irq get correct node setting
when there is no ram on node 0. Signed-off-by: NYinghai Lu <yinghai@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> LKML-Reference: <4A95C32D.5040605@kernel.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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