OTHER: add missing return values to medialib_updater
OTHER: add missing return values to medialib_updater

The returnvalues are selected under the assumption that
updater_remove_watcher returns if the operation was sucessful and
updater_remove_directory_by_id returns if the function should continue to be
called

chrippa/xmms2,mantaraya36/xmms2-mantaraya36,mantaraya36/xmms2-mantaraya36,mantaraya36/xmms2-mantaraya36,mantaraya36/xmms2-mantaraya36,xmms2/xmms2-stable,theeternalsw0rd/xmms2,six600110/xmms2,krad-radio/xmms2-krad,theefer/xmms2,chrippa/xmms2,oneman/xmms2-oneman-old,theefer/xmms2,theeternalsw0rd/xmms2,dreamerc/xmms2,oneman/xmms2-oneman-old,six600110/xmms2,theeternalsw0rd/xmms2,oneman/xmms2-oneman,oneman/xmms2-oneman,mantaraya36/xmms2-mantaraya36,mantaraya36/xmms2-mantaraya36,dreamerc/xmms2,six600110/xmms2,theefer/xmms2,krad-radio/xmms2-krad,theefer/xmms2,theeternalsw0rd/xmms2,xmms2/xmms2-stable,oneman/xmms2-oneman,xmms2/xmms2-stable,chrippa/xmms2,krad-radio/xmms2-krad,krad-radio/xmms2-krad,six600110/xmms2,oneman/xmms2-oneman-old,xmms2/xmms2-stable,oneman/xmms2-oneman,dreamerc/xmms2,oneman/xmms2-oneman-old,xmms2/xmms2-stable,mantaraya36/xmms2-mantaraya36,chrippa/xmms2,chrippa/xmms2,chrippa/xmms2,krad-radio/xmms2-krad,theefer/xmms2,dreamerc/xmms2,oneman/xmms2-oneman-old,oneman/xmms2-oneman,six600110/xmms2,theefer/xmms2,six600110/xmms2,xmms2/xmms2-stable,oneman/xmms2-oneman,theefer/xmms2,dreamerc/xmms2,krad-radio/xmms2-krad,theeternalsw0rd/xmms2,oneman/xmms2-oneman,theeternalsw0rd/xmms2