Optional gui (#29)

* Fix one more memleak

src/nsm.h

@@ -385,6 +385,7 @@ nsm_free ( nsm_client_t *nsm )
     else
         lo_server_free( _NSM()->_server );
 
+    lo_address_free(_NSM()->nsm_addr);
     free(_NSM()->nsm_client_id);
     free(_NSM()->_session_manager_name);
     free(_NSM()->_session_manager_features);