xive: Fix failure to lower CPPR in opal_xive_get_xirr()
xive: Fix failure to lower CPPR in opal_xive_get_xirr()

There is a theorical possibility that if we don't get any
pending interrupt in the queue in opal_xive_get_xirr() due
to a spurious notification we leave the CPPR elevated.

Signed-off-by: Benjamin Herrenschmidt <a7089bb6e7e92505d88aaff006cbdd60cc9120b6@kernel.crashing.org>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

shenki/skiboot,open-power/skiboot,shenki/skiboot,legoater/skiboot,qemu/skiboot,qemu/skiboot,mikey/skiboot,open-power/skiboot,open-power/skiboot,shenki/skiboot,open-power/skiboot,stewart-ibm/skiboot,mikey/skiboot,shenki/skiboot,legoater/skiboot,legoater/skiboot,legoater/skiboot,open-power/skiboot,qemu/skiboot,legoater/skiboot,shenki/skiboot,stewart-ibm/skiboot,qemu/skiboot,mikey/skiboot,stewart-ibm/skiboot,qemu/skiboot