[POWERPC] iSeries_init_IRQ non-PCI tidy
ppc_md.init_IRQ is not called if it is NULL, so we don't need an empty routine in the non PCI case. Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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