spapr: fix possible Negative array index read
fix CID 1351391. Signed-off-by: NGonglei <arei.gonglei@huawei.com> Message-Id: <1456998223-12356-6-git-send-email-arei.gonglei@huawei.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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