PCI: xgene: Do PCI error check on own line & keep return value

Instead of an "if" condition with a line split, use the usual error
handling pattern with a separate variable to improve readability.

pci_generic_config_read32() already returns either PCIBIOS_SUCCESSFUL or
PCIBIOS_DEVICE_NOT_FOUND so it is enough to simply return its return value
when ret != PCIBIOS_SUCCESSFUL.

No functional changes intended.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

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