hgext/__init__.py

revlog: reorder a conditionnal about revlogio

if we are using REVLOGV0, we will not use a rust based index. This small line
movement make it clearer.

Differential Revision: https://phab.mercurial-scm.org/D7830

from __future__ import absolute_import
import pkgutil

__path__ = pkgutil.extend_path(__path__, __name__)