PCI: acpiphp: check whether _ADR evaluation succeeded
Check whether we evaluated _ADR successfully. Previously we ignored
failure, so we would have used garbage data from the stack as the device
and function number.
We return AE_OK so that we ignore only this slot and continue looking
for other slots.
Found by Coverity (CID 113981).
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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