Don't call uev_timer_set() when stopping timer, just close() it

The semantics for timerfd in Linux is to use close() to stop,
so no need for the extra overhead with uev_timer_set().

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/timer.c

@@ -170,17 +170,12 @@ int uev_timer_start(uev_t *w)
  */
 int uev_timer_stop(uev_t *w)
 {
-	/* Check if already stopped in uev_run() after cb() or _init() */
 	if (!_uev_watcher_active(w))
 		return 0;
 
-	/* Stop kernel timer */
-	uev_timer_set(w, 0, 0);
-
 	if (_uev_watcher_stop(w))
 		return -1;
 
-	/* Close timerfd, will have to be reopened again on reset */
 	close(w->fd);
 	w->fd = -1;