add a missing return

OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs

@@ -11299,6 +11299,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                         // Really doesn't exist
                         m_log.WarnFormat("[llClient]: landmark asset {0} not found",lmid.ToString());
                         SendTeleportFailed("Could not find the landmark asset data");
+                        return true;
                     }
                 }