PCI/ACPI: Check acpi_resource_to_address64() return value

We should check the acpi_resource_to_address64() return value, which
also removes the need to validate the resource type beforehand.
No functional change.

Found by Coverity (CID 113815).
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/pci_root.c

@@ -100,13 +100,12 @@ get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
 {
 	struct resource *res = data;
 	struct acpi_resource_address64 address;
+	acpi_status status;
 
-	if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
-	    resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
-	    resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
+	status = acpi_resource_to_address64(resource, &address);
+	if (ACPI_FAILURE(status))
 		return AE_OK;
 
-	acpi_resource_to_address64(resource, &address);
 	if ((address.address_length > 0) &&
 	    (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
 		res->start = address.minimum;