struct i2c_rdwr_ioctl_data data;
    data.nmsgs = count;
    data.msgs = msgs;

    return ioctl(adapter->fd, I2C_RDWR, &data);

So we will end up recreating the exact situation as when
virtio_i2c_xfer() is called.

Perfect! I was hoping exactly for this. But with my limited experience
of all the blocks involved, I decided to ask for this instead of digging
into various sources. Looks good.