PCI/AER: Return error if AER is not supported
get_device_error_info() reads error information from registers in the AER capability. If we call it for a device that has no AER capability, it should return an error, but previously it returned success. Return 0 (error) if the device doesn't have an AER capability. Signed-off-by: Keith Busch <keith.busch@intel.com> [bhelgaas: changelog] Signed-off-by: Bjorn Helgaas <helgaas@kernel.org>
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