pull: avoid referencing a variable before it is initialized
If `urlutil.get_pull_paths()` somehow yields nothing, the reference after the
loop appears to be a problem. I noticed this because PyCharm flagged (and still
flags) the initialization of this inside the loop as somehow unused. I'm not
sure why 1 isn't returned directly where it is set to the result of
`postincoming()`, but maybe the code is structured this way in anticipation of
future work.
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)