Revert "Count inactivity since last poll time."

This actually solves only half of the problem, reverting for now.

This reverts commit 8caf9941.

src/knot/server/tcp-handler.c

@@ -595,7 +595,7 @@ int tcp_loop_worker(dthread_t *thread)
 	/* Accept clients. */
 	dbg_net("tcp: worker %p started\n", w);
 	fdset_t *set = &w->set;
-	timev_t next_sweep, last_poll_time;
+	timev_t next_sweep;
 	time_now(&next_sweep);
 	next_sweep.tv_sec += TCP_SWEEP_INTERVAL;
 	for (;;) {
@@ -609,9 +609,6 @@ int tcp_loop_worker(dthread_t *thread)
 		if (nfds < 0)
 			continue;
 
-		/* Mark the time of the last poll. */
-		time_now(&last_poll_time);
-
 		/* Establish timeouts. */
 		rcu_read_lock();
 		int max_idle = conf()->max_conn_idle;
@@ -658,12 +655,14 @@ int tcp_loop_worker(dthread_t *thread)
 		}
 
 		/* Sweep inactive. */
-		if (last_poll_time.tv_sec >= next_sweep.tv_sec) {
-			fdset_sweep(set, &tcp_sweep, NULL);
-			time_now(&next_sweep);
-			next_sweep.tv_sec += TCP_SWEEP_INTERVAL;
+		timev_t now;
+		if (time_now(&now) == 0) {
+			if (now.tv_sec >= next_sweep.tv_sec) {
+				fdset_sweep(set, &tcp_sweep, NULL);
+				memcpy(&next_sweep, &now, sizeof(next_sweep));
+				next_sweep.tv_sec += TCP_SWEEP_INTERVAL;
+			}
 		}
-
 	}
 
 	/* Stop whole unit. */