[vala/0.40] codegen: Use loop index instead of get_ccode_pos() for ellipsis parameter

[Rico Tzschichholz <ricotz src gnome org>]

commit f3b443de1b2912930033b6036bce5ac130822a24
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Mon May 18 09:31:41 2020 +0200

    codegen: Use loop index instead of get_ccode_pos() for ellipsis parameter
    
    Otherwise this will cause an index clash resulting in loosing the first
    variable list parameter.
    
    Regression of b1cb7036bee1f21e98e93ac34b31a95eeed32815
    
    Fixes https://gitlab.gnome.org/GNOME/vala/issues/995

 codegen/valaccodemethodcallmodule.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/codegen/valaccodemethodcallmodule.vala b/codegen/valaccodemethodcallmodule.vala
index 2cc20449d..a36a11119 100644
--- a/codegen/valaccodemethodcallmodule.vala
+++ b/codegen/valaccodemethodcallmodule.vala
@@ -484,7 +484,7 @@ public class Vala.CCodeMethodCallModule : CCodeAssignmentModule {
                                }
                        }
 
-                       arg_pos = get_param_pos (param != null ? get_ccode_pos (param) : i, ellipsis);
+                       arg_pos = get_param_pos (param != null && !ellipsis ? get_ccode_pos (param) : i, 
ellipsis);
                        carg_map.set (arg_pos, cexpr);
 
                        if (arg is NamedArgument && ellipsis) {