BUG(2059): Free xmmsv_t instances after we sent them over the wire.
BUG(2059): Free xmmsv_t instances after we sent them over the wire.

Before xmmsv we needed to make sure we don't destroy GTrees,
GLists etc, so we used to only call g_free on the xmmsv_cmd_value_t.
The xmmsv_t's that we created don't know about the GLib objects they
are populated from, so we can just unref the xmmsv_t unconditionally
now.

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