[CBRD-24961] SP's out parameters takes wrong value (#4617)

http://jira.cubrid.org/browse/CBRD-24961

When sending db_values for out arguments, an index of the argument array was wrongly assigned.
It fixes the wrong assigned index by using dummy null db_values.

src/communication/network_interface_sr.c

@@ -10442,10 +10442,12 @@ smethod_invoke_fold_constants (THREAD_ENTRY * thread_p, unsigned int rid, char *
     {
       /* 3) make out arguments */
 
+      method_sig_node *sig = sig_list.method_sig;
       // *INDENT-OFF*
-      std::vector<std::reference_wrapper<DB_VALUE>> out_args;
+      DB_VALUE dummy_null;
+      db_make_null (&dummy_null);
+      std::vector<std::reference_wrapper<DB_VALUE>> out_args (sig->num_method_args, dummy_null);
       // *INDENT-ON*
-      method_sig_node *sig = sig_list.method_sig;
       for (int i = 0; i < sig->num_method_args; i++)
 	{
 	  if (sig->arg_info.arg_mode[i] == METHOD_ARG_MODE_IN)
@@ -10454,7 +10456,7 @@ smethod_invoke_fold_constants (THREAD_ENTRY * thread_p, unsigned int rid, char *
 	    }
 
 	  int pos = sig->method_arg_pos[i];
-	  out_args.push_back (std::ref (args[pos]));
+	  out_args[pos] = std::ref (args[pos]);
 	}
 
       /* 4) pack */