[POWERPC] mpic: Make sparse happy
I was running sparse on something else and noticed sparse warnings and especially the bogus code that is fixed by the first hunk of this patch, so I fixed them all while at it. Signed-off-by: NJohannes Berg <johannes@sipsolutions.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Milton Miller <miltonm@bga.com> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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