XCB/screen: memory leak

(cherry picked from commit b4581502f18d4b8476b2fea0f4da2e1a22b85e03)

modules/access/screen/xcb.c

@@ -380,6 +380,7 @@ static void Demux (void *data)
                 y += oh - h;
             else if (ptr->root_y > min_y)
                 y += ptr->root_y - min_y;
+            free (ptr);
         }
     }