GPU-DRM-QXL: Move three assignments in qxl_device_init()

[SF Markus Elfring]

> Markus, please contact the list in advance in future before posting a bunch
> of patches that don't fix any problems.

I am trying to improve various open issues also in Linux source files.

Unfortunately, some of the proposed changes might not fit to your software
development attention at the moment.
How are the chances that corresponding change acceptance will evolve a bit more
after a while?

Regards,
Markus