hgext/__init__.py

statprof: with Python 3.12, lineno is (more) often None

test-profile.t failed with errors like:
  TypeError: %d format: a real number is required, not NoneType

statprof.py already handled None values as -1 in some cases. Do the same in
more cases.

import pkgutil

__path__ = pkgutil.extend_path(__path__, __name__)