BUG(461): Do not assert in musepack's get_mediainfo
BUG(461): Do not assert in musepack's get_mediainfo

Abuse of g_return_if_fail replaced with return's

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