timer: Use dual_timestamp_is_set() in one more place

diff --git a/src/core/timer.c b/src/core/timer.c
index 4b8a1635121fcefd5cb770653364af859deaa4da..aab376e5cc775c03df20f01f1e424c60b9bdd941 100644 (file)
--- a/src/core/timer.c
+++ b/src/core/timer.c
@@ -399,7 +399,7 @@ static void timer_enter_waiting(Timer *t, bool time_change) {
                          * to that. If we don't, just start from
                          * the activation time. */
 
-                        if (t->last_trigger.realtime > 0)
+                        if (dual_timestamp_is_set(&t->last_trigger))
                                 b = t->last_trigger.realtime;
                         else if (dual_timestamp_is_set(&UNIT(t)->inactive_exit_timestamp))
                                 b = UNIT(t)->inactive_exit_timestamp.realtime;