selection: only report RTT if there is an answer

Previously this would pollute the RTT cache with non-sensical
measurements from unsuccessful TCP connects for example.

diff --git a/daemon/worker.c b/daemon/worker.c
index 8f7382a4e08c8739b66200e107a363a82663823d..8a6d08b75aab0fdff88fe69d2dff42969fd082c7 100644 (file)
--- a/daemon/worker.c
+++ b/daemon/worker.c
@@ -1599,7 +1599,7 @@ static int qr_task_step(struct qr_task *task,
        }
 
        // Report network RTT back to server selection
-       if (task->send_time && task->recv_time) {
+       if (packet && task->send_time && task->recv_time) {
                struct kr_query *qry = array_tail(req->rplan.pending);
                qry->server_selection.update_rtt(qry, task->transport, task->recv_time - task->send_time);
        }