ACPICA: Fix extraneous warning if _DSM returns a package

_DSM can return any type of object, so validation on the return
type cannot be performed. ACPICA BZ 802.

http://www.acpica.org/bugzilla/show_bug.cgi?id=802

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/acpica/nspredef.c

@@ -193,11 +193,15 @@ acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
 	}
 
 	/*
-	 * We have a return value, but if one wasn't expected, just exit, this is
+	 * 1) We have a return value, but if one wasn't expected, just exit, this is
 	 * not a problem. For example, if the "Implicit Return" feature is
 	 * enabled, methods will always return a value.
+	 *
+	 * 2) If the return value can be of any type, then we cannot perform any
+	 * validation, exit.
 	 */
-	if (!predefined->info.expected_btypes) {
+	if ((!predefined->info.expected_btypes) ||
+	    (predefined->info.expected_btypes == ACPI_RTYPE_ALL)) {
 		goto cleanup;
 	}