merge 3.3 (#17968)

Modules/posixmodule.c

@@ -10121,6 +10121,7 @@ posix_listxattr(PyObject *self, PyObject *args, PyObject *kwargs)
         if (length < 0) {
             if (errno == ERANGE) {
                 PyMem_FREE(buffer);
+                buffer = NULL;
                 continue;
             }
             path_error(&path);