Fix Binder's code generation.

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@3874 8e941d3f-bd1b-0410-a28a-d453659cc2b4

wst/trunk/ws_helper/generator.pas

@@ -1363,7 +1363,7 @@ Var
       for k := 0 to Pred(prmCnt) do begin
         prm := TPasArgument(prms[k]);
         if SymbolTable.IsInitNeed(prm.ArgType) then
-          WriteLn('%s := nil;',[RETURN_VAL_NAME]);
+          WriteLn('%s := nil;',[prm.Name]);
       end;
 
       NewLine();