wocky-connector: xmpp_features_cb: don't leak our previous reference on priv->features if any
wocky-connector: xmpp_features_cb: don't leak our previous reference on priv->features if any

freedesktop-unofficial-mirror/wocky,freedesktop-unofficial-mirror/wocky,freedesktop-unofficial-mirror/wocky,noonien-d/wocky,noonien-d/wocky,noonien-d/wocky