PCI: Fix missing inline for pci_pr3_present()

The inline prefix was missing in the dummy function pci_pr3_present()
definition.  Fix it.
Reported-by: kbuild test robot <lkp@intel.com>
Fixes: 52525b7a ("PCI: Add a helper to check Power Resource Requirements _PR3 existence")
Link: https://lore.kernel.org/r/201910212111.qHm6OcWx%lkp@intel.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

include/linux/pci.h

@@ -2314,7 +2314,7 @@ bool pci_pr3_present(struct pci_dev *pdev);
 #else
 static inline struct irq_domain *
 pci_host_bridge_acpi_msi_domain(struct pci_bus *bus) { return NULL; }
-static bool pci_pr3_present(struct pci_dev *pdev) { return false; }
+static inline bool pci_pr3_present(struct pci_dev *pdev) { return false; }
 #endif
 
 #ifdef CONFIG_EEH