Remove idle source on dispose in Unix context manager
Remove idle source on dispose in Unix context manager

Otherwise, the callback could be called on a disposed object.

GNOME/gupnp,GNOME/gupnp,ZachGoldberg/gupnp-gi,ZachGoldberg/gupnp-gi,GNOME/gupnp,ZachGoldberg/gupnp-gi,GNOME/gupnp