[vala] method: Use prototype-string for return-type mismatch

[Rico Tzschichholz <ricotz src gnome org>]

commit 93f16c468161114e3cbeb2dedd6911f3f014ad74
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sat Sep 9 18:47:20 2017 +0200

    method: Use prototype-string for return-type mismatch
    
    Include owndership transfer classifier to fix deficiency of
    faa7dc16046a4a002ad23c90cf4ca1f9007adaa2

 vala/valamethod.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/vala/valamethod.vala b/vala/valamethod.vala
index c37cfe7..3544b67 100644
--- a/vala/valamethod.vala
+++ b/vala/valamethod.vala
@@ -347,7 +347,7 @@ public class Vala.Method : Subroutine, Callable {
 
                var actual_base_type = base_method.return_type.get_actual_type (object_type, 
method_type_args, this);
                if (!return_type.equals (actual_base_type)) {
-                       invalid_match = "Base method expected return type `%s', but `%s' was provided".printf 
(actual_base_type.to_qualified_string (), return_type.to_qualified_string ());
+                       invalid_match = "Base method expected return type `%s', but `%s' was provided".printf 
(actual_base_type.to_prototype_string (), return_type.to_prototype_string ());
                        return false;
                }