of_pci: use of_property_read_u32()
of_get_pci_domain_nr() somehow didn't use of_property_read_u32() though it was long available, basically open-coding it. Using the modern DT API saves several LoCs/bytes and also adds some prop sanity checks as a bonus... Signed-off-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: NRob Herring <robh@kernel.org>
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