fix registration overlap timeout snafu

libs/sofia-sip/libsofia-sip-ua/nta/nta.c

@@ -8660,6 +8660,10 @@ void outgoing_destroy(nta_outgoing_t *orq)
   orq->orq_destroyed = 1;
   orq->orq_callback = outgoing_default_cb;
   orq->orq_magic = NULL;
+
+  if (orq->orq_method != sip_method_invite &&
+      orq->orq_method != sip_method_ack)
+    outgoing_terminate(orq);
 }
 
 /** @internal Outgoing transaction timer routine.