parsers.c: there is no reference to data_obj, so it shouldn't be decref'ed

mercurial/parsers.c

@@ -406,7 +406,6 b' quit:'
 	Py_XDECREF(nodemap);
 	Py_XDECREF(cache);
 	Py_XDECREF(rval);
-	Py_XDECREF(data_obj);
 	return NULL;
 }