add JUST wrapper (#5681)

Co-authored-by: oneflow-ci-bot <69100618+oneflow-ci-bot@users.noreply.github.com>

oneflow/core/framework/rpc_util.cpp

@@ -35,7 +35,7 @@ namespace oneflow {
     CHECK_LT_OR_RETURN(elapsed_seconds.count(), seconds)
         << Error::TimeoutError() << "Timeout error at " << seconds << " seconds.";
   }
-  if (ctx.rpc_token().type() == kCtrlRpcTokenType) { ctx.rpc_token().ReleaseCtrlRpcToken(); }
+  if (ctx.rpc_token().type() == kCtrlRpcTokenType) { JUST(ctx.rpc_token().ReleaseCtrlRpcToken()); }
   return Maybe<void>::Ok();
 }