ACPI: It is OK to not have a _PPC, so don't error out if it's not found

drivers/acpi/processor.c

@@ -763,7 +763,7 @@ acpi_processor_get_platform_limit (
 	 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
 	 */
 	status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
-	if(ACPI_FAILURE(status)) {
+	if(ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PPC\n"));
 		return_VALUE(-ENODEV);
 	}