logind: minor session time handling tweaks

src/login/logind-session.c

@@ -810,7 +810,7 @@ int session_release(Session *s) {
         return sd_event_add_time(s->manager->event,
                                  &s->timer_event_source,
                                  CLOCK_MONOTONIC,
-                                 now(CLOCK_MONOTONIC) + RELEASE_USEC, 0,
+                                 usec_add(now(CLOCK_MONOTONIC), RELEASE_USEC), 0,
                                  release_timeout_callback, s);
 }
 

src/login/logind-session.h

@@ -97,6 +97,7 @@ struct Session {
 
         sd_bus_message *create_message;
 
+        /* Set up when a client requested to release the session via the bus */
         sd_event_source *timer_event_source;
 
         char *controller;