misc/pvpanic: simplify the code using acpi_dev_resource_io

Use acpi_dev_resource_io API.

Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/pvpanic.c

@@ -77,17 +77,14 @@ static struct notifier_block pvpanic_panic_nb = {
 static acpi_status
 pvpanic_walk_resources(struct acpi_resource *res, void *context)
 {
-	switch (res->type) {
-	case ACPI_RESOURCE_TYPE_END_TAG:
-		return AE_OK;
+	struct resource r;
 
-	case ACPI_RESOURCE_TYPE_IO:
-		port = res->data.io.minimum;
+	if (acpi_dev_resource_io(res, &r)) {
+		port = r.start;
 		return AE_OK;
-
-	default:
-		return AE_ERROR;
 	}
+
+	return AE_ERROR;
 }
 
 static int pvpanic_add(struct acpi_device *device)