powerpc/axon_msi: Validate msi irq via chip_data
Instead of checking for rogue msi numbers via the irq_map host field set the chip_data to h.host_data (which is the msic struct pointer) at map and compare it in get_irq. Signed-off-by: NMilton Miller <miltonm@bga.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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