ike-mobike: Don't trigger update for NAT mapping change detected during an address update

This is really only needed for other exchanges like DPDs not when we
just updated the addresses. The NAT-D payloads are only used here to
detect whether UDP encapsulation has to be enabled/disabled.

src/libcharon/sa/ikev2/tasks/ike_mobike.c

@@ -574,7 +574,7 @@ METHOD(task_t, process_i, status_t,
 		if (this->natd)
 		{
 			this->natd->task.process(&this->natd->task, message);
-			if (this->natd->has_mapping_changed(this->natd))
+			if (!this->update && this->natd->has_mapping_changed(this->natd))
 			{
 				/* force an update if mappings have changed */
 				this->update = this->check = TRUE;