Don't emit confusing messages about errors during cleanup

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4578 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishtest/vtc_log.c

@@ -123,6 +123,8 @@ static const char * const lead[] = {
 static void
 vtc_log_emit(struct vtclog *vl, unsigned lvl)
 {
+	if (vtc_stop && lvl == 0)
+		return;
 	AZ(pthread_mutex_lock(&vtclog_mtx));
 	vsb_cat(vtclog_full, vsb_data(vl->vsb));
 	AZ(pthread_mutex_unlock(&vtclog_mtx));