vici: Signal waiting threads when skipping disconnected connections

If two threads are waiting in find_entry() and remove_entry(),
respectively, and the former is woken first, the latter remains stuck
as it won't get signaled.

src/libcharon/plugins/vici/vici_socket.c

@@ -191,6 +191,7 @@ static entry_t* find_entry(private_vici_socket_t *this, stream_t *stream,
 			}
 			if (entry->disconnecting)
 			{
+				entry->cond->signal(entry->cond);
 				continue;
 			}
 			candidate = TRUE;