src/util/starpu_insert_task_utils.c: free allocated memory

cl_arg_wrapper->arg_stack contains the buffer allocated by _starpu_codelet_pack_args()

src/util/starpu_insert_task_utils.c

@@ -39,6 +39,7 @@ void starpu_task_insert_callback_wrapper(void *_cl_arg_wrapper)
 	if (cl_arg_wrapper->callback_func)
 		cl_arg_wrapper->callback_func(cl_arg_wrapper->callback_arg);
 
+	free(cl_arg_wrapper->arg_stack);
 	free(cl_arg_wrapper);
 }