[gamin] gam_listener.c clean up

["Neal H. Walfield" <neal walfield org>]

Here is a clean up for gam_listener.c.

There was one buglet: gam_connection_request calls
gam_back_subscription and then gam_listener_remove_subscription.  The
former calls the backend _remove_subscription functions which all also
call gam_listener_remove_subscription.  The backend shouldn't worry
about the listener.

There are no regression in the test suite using the dnotify backend.

Attachment: gam-listen.diff
Description: Binary data