- guestfs_set_private (g, key, NULL);
-
- guestfs_delete_event_callback (g, event_handle);
+ cb = guestfs_get_private (g, key);
+ if (cb) {
+ SvREFCNT_dec (cb);
+ guestfs_set_private (g, key, NULL);
+ guestfs_delete_event_callback (g, event_handle);
+ }