Fix for vblank on nvc0

[Maarten Lankhorst]

Op 12-11-12 22:30, Kelly Doran schreef:
> I had Sven test this patch... he said it works.  I think chipset
> number test was executing code that we thought was only either 0x50 or
> 0xc0, but was actually more specific with things like 0x92.
>
Oh right vblank is busted anyway... needs to be nv_device(priv-)>card_type == NV_50 to work.

Your patch is the correct fix.

~Maarten