PCI: Always define the of_node helpers

Simply move these inline functions outside the ifdef instead of duplicating
them as stubs in the !OF case.  The struct device of_node field does not
depend on OF.

This also fixes the missing stubbed pci_bus_to_OF_node().
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Bjorn Helgaas <helgaas@kernel.org>

include/linux/pci.h

@@ -2182,24 +2182,11 @@ int pci_parse_request_of_pci_ranges(struct device *dev,
 /* Arch may override this (weak) */
 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus);
 
-static inline struct device_node *
-pci_device_to_OF_node(const struct pci_dev *pdev)
-{
-	return pdev ? pdev->dev.of_node : NULL;
-}
-
-static inline struct device_node *pci_bus_to_OF_node(struct pci_bus *bus)
-{
-	return bus ? bus->dev.of_node : NULL;
-}
-
 #else	/* CONFIG_OF */
 static inline void pci_set_of_node(struct pci_dev *dev) { }
 static inline void pci_release_of_node(struct pci_dev *dev) { }
 static inline void pci_set_bus_of_node(struct pci_bus *bus) { }
 static inline void pci_release_bus_of_node(struct pci_bus *bus) { }
-static inline struct device_node *
-pci_device_to_OF_node(const struct pci_dev *pdev) { return NULL; }
 static inline struct irq_domain *
 pci_host_bridge_of_msi_domain(struct pci_bus *bus) { return NULL; }
 static inline int pci_parse_request_of_pci_ranges(struct device *dev,
@@ -2210,6 +2197,17 @@ static inline int pci_parse_request_of_pci_ranges(struct device *dev,
 }
 #endif  /* CONFIG_OF */
 
+static inline struct device_node *
+pci_device_to_OF_node(const struct pci_dev *pdev)
+{
+	return pdev ? pdev->dev.of_node : NULL;
+}
+
+static inline struct device_node *pci_bus_to_OF_node(struct pci_bus *bus)
+{
+	return bus ? bus->dev.of_node : NULL;
+}
+
 #ifdef CONFIG_ACPI
 struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus);