dns plugin: Only submit dns-traffic if either counter is non-zero.

diff --git a/src/dns.c b/src/dns.c
index 5af9c20..7ce7aad 100644 (file)
--- a/src/dns.c
+++ b/src/dns.c
@@ -348,7 +348,9 @@ static int dns_read (void)
        values[0] = tr_queries;
        values[1] = tr_responses;
        pthread_mutex_unlock (&traffic_mutex);
-       submit_octets (values[0], values[1]);
+
+       if ((values[0] != 0) || (values[1] != 0))
+               submit_octets (values[0], values[1]);
 
        pthread_mutex_lock (&qtype_mutex);
        for (ptr = qtype_list, len = 0;