fix td ring buffer total size function

static UWord32 ivas_td_ringbuf_total_size(

    TD_RINGBUF_HANDLE h )

{

    UWord32 total_size;

    IF( h->is_full )

    {

        total_size = h->capacity;

        return h->capacity;

    }

    IF( h->read_pos <= h->write_pos )

    {

        total_size = L_sub( h->write_pos, h->read_pos );

        return L_sub( h->write_pos, h->read_pos );

    }

    /* else wrap around */

    total_size = L_add( h->write_pos, L_sub( h->capacity, h->read_pos ) );

    return total_size;

    return L_add( h->write_pos, L_sub( h->capacity, h->read_pos ) );

}