spapr: sanitize error handling in spapr_ics_create()
The spapr_ics_create() function handles errors in a rather convoluted way, with two local Error * variables. Moreover, failing to parent the ICS object to the machine should be considered as a bug but it is currently ignored. This patch addresses both issues. Signed-off-by: NGreg Kurz <groug@kaod.org> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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