[vala/0.50] codegen: Don't add generics arguments/parameters to async finish method

[Rico Tzschichholz <ricotz src gnome org>]

commit a96215555e42b61e40bfcbf64af2cfadf036a0bd
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue Mar 9 15:52:30 2021 +0100

    codegen: Don't add generics arguments/parameters to async finish method

 codegen/valaccodemethodmodule.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/codegen/valaccodemethodmodule.vala b/codegen/valaccodemethodmodule.vala
index 2ec6b8899..025c05351 100644
--- a/codegen/valaccodemethodmodule.vala
+++ b/codegen/valaccodemethodmodule.vala
@@ -979,7 +979,7 @@ public abstract class Vala.CCodeMethodModule : CCodeStructModule {
                        cparam_map.set (get_param_pos (get_ccode_instance_pos (m)), class_param);
                }
 
-               if (is_gtypeinstance_creation_method (m)) {
+               if (is_gtypeinstance_creation_method (m) && (direction & 1) == 1) {
                        // memory management for generic types
                        int type_param_index = 0;
                        var cl = (Class) m.parent_symbol;