If we decide not to eliminate the worker thread, properly do so.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2654 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_pool.c

@@ -388,6 +388,8 @@ wrk_decimate_flock(struct wq *qp, double t_idle)
 	w = VTAILQ_LAST(&qp->idle, workerhead);
 	if (w != NULL && (w->used < t_idle || qp->nthr > nthr_max))
 		VTAILQ_REMOVE(&qp->idle, w, list);
+	else
+		w = NULL;
 	UNLOCK(&qp->mtx);
 
 	/* And give it a kiss on the cheek... */