src/util/starpu_task_insert.c: revert #13925, that was not a memory leak, rather a misuse of the API

src/util/starpu_task_insert.c

@@ -59,7 +59,6 @@ void starpu_codelet_unpack_args(void *_cl_arg, ...)
 	}
 
 	va_end(varg_list);
-	free(_cl_arg);
 }
 
 static