xwayland: free xcb events

xwayland/xwm.c

@@ -211,6 +211,7 @@ static int x11_event_handler(int fd, uint32_t mask, void *data) {
 				event->response_type & XCB_EVENT_RESPONSE_TYPE_MASK);
 			break;
 		}
+		free(event);
 	}
 
 	xcb_flush(xwm->xcb_conn);