udev: do not use sd_event_source_disable_unref() at more places

Fixes a bug introduced by 9612da361a.

Follow-up for f777e745a7.

src/udev/udev-ctrl.c

@@ -101,7 +101,7 @@ static void udev_ctrl_disconnect(UdevCtrl *uctrl) {
         if (!uctrl)
                 return;
 
-        uctrl->event_source_connect = sd_event_source_disable_unref(uctrl->event_source_connect);
+        uctrl->event_source_connect = sd_event_source_unref(uctrl->event_source_connect);
         uctrl->sock_connect = safe_close(uctrl->sock_connect);
 }
 
@@ -110,7 +110,7 @@ static UdevCtrl *udev_ctrl_free(UdevCtrl *uctrl) {
 
         udev_ctrl_disconnect(uctrl);
 
-        sd_event_source_disable_unref(uctrl->event_source);
+        sd_event_source_unref(uctrl->event_source);
         safe_close(uctrl->sock);
 
         sd_event_unref(uctrl->event);

src/udev/udevd.c

@@ -178,8 +178,10 @@ static Event *event_free(Event *event) {
         LIST_REMOVE(event, event->manager->events, event);
         sd_device_unref(event->dev);
 
-        sd_event_source_disable_unref(event->timeout_warning_event);
-        sd_event_source_disable_unref(event->timeout_event);
+        /* Do not use sd_event_source_disable_unref() here, as this is called by both workers and the
+         * main process. */
+        sd_event_source_unref(event->timeout_warning_event);
+        sd_event_source_unref(event->timeout_event);
 
         if (event->worker)
                 event->worker->event = NULL;