iommu/vtd: Replace acpi_bus_get_device()

Replace acpi_bus_get_device() that is going to be dropped with
acpi_fetch_acpi_dev().

No intentional functional impact.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/1807113.tdWV9SEqCh@kreacherSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/intel/dmar.c

@@ -789,7 +789,8 @@ static int __init dmar_acpi_dev_scope_init(void)
 				       andd->device_name);
 				continue;
 			}
-			if (acpi_bus_get_device(h, &adev)) {
+			adev = acpi_fetch_acpi_dev(h);
+			if (!adev) {
 				pr_err("Failed to get device for ACPI object %s\n",
 				       andd->device_name);
 				continue;