drm/amdkfd: report the real PCI bus number

Since the PCI bus number retrieved by PCI_BUS_NUM(pdev->devfn)
is wrong.
Signed-off-by: NEvan Quan <evan.quan@amd.com>
Reviewed-by: NFelix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_iommu.c

@@ -192,7 +192,7 @@ static int iommu_invalid_ppr_cb(struct pci_dev *pdev, int pasid,
 
 	dev_warn_ratelimited(kfd_device,
 			"Invalid PPR device %x:%x.%x pasid 0x%x address 0x%lX flags 0x%X",
-			PCI_BUS_NUM(pdev->devfn),
+			pdev->bus->number,
 			PCI_SLOT(pdev->devfn),
 			PCI_FUNC(pdev->devfn),
 			pasid,