s390x/pci: fix reg_irqs()
In reg_irqs(), present code assumes that map_indicator() always issues successfully. Let's check it and return the error to caller in order to inform guest. Signed-off-by: NYi Min Zhao <zyimin@linux.vnet.ibm.com> Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: NPierre Morel <pmorel@linux.vnet.ibm.com> Reviewed-by: NDong Jia Shi <bjsdjshi@linux.vnet.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>
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