finalize_signature (MusicBrainz::TRM)

    /*
     * Finalize generated signature.
     *
     * Call this after MusicBrainz::TRM#generate_signature has returned true.
     *
     * Accepts an optional 16-byte string, used to associate the signature
     * with a particular collection in the RElatable Engine.  Returns nil on
     * error, or a 16 byte signature on success.
     *
     * Example:
     *   sig = trm.finalize_signature
     *
     */
    static VALUE mb_trm_finalize_sig(int argc, VALUE *argv, VALUE self) {