[vala/staging] codegen: Don't create duplicated complete-async code

[Rico Tzschichholz <ricotz src gnome org>]

commit 6ed2ec810d75f49478dbfdb5c6d98b2fc909e9f6
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Mon Feb 13 17:30:29 2017 +0100

    codegen: Don't create duplicated complete-async code
    
    Treat methods with non-void return-type special while they require a return
    statement. This does not account for a trailing superfluous "return" which
    will still trigger this code-duplication.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=778302

 codegen/valaccodemethodmodule.vala |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/codegen/valaccodemethodmodule.vala b/codegen/valaccodemethodmodule.vala
index 1f47af9..f28fe86 100644
--- a/codegen/valaccodemethodmodule.vala
+++ b/codegen/valaccodemethodmodule.vala
@@ -769,7 +769,8 @@ public abstract class Vala.CCodeMethodModule : CCodeStructModule {
                                        }
                                }
 
-                               if (m.coroutine) {
+                               // For non-void return-types GAsyncModule.visit_return_statement () will take 
care of this
+                               if (m.return_type is VoidType && m.coroutine) {
                                        // epilogue
                                        complete_async ();
                                }