spitz backlight: fix brightness limiting

[Pavel Machek]

On Thu 2009-10-22 23:43:19, Richard Purdie wrote:
> On Thu, 2009-10-22 at 04:20 +0800, Eric Miao wrote:
> > It's a little bit weird it's called 'limit_mask' when I first converted it
> > to a spi driver. There must be some reasons, Richard, you've got
> > any ideas?
> 
> Its a historical artifact that once worked through some bitfield magic
> but probably stopped working when we increased the range of values the
> backlight could accept and we didn't notice the limiting problem.
> 
> I'll happily take a patch to fix that.

Patch is available in the parent post. For now, I just fix it so that
it does not turn backlight off when it should not. I'll submit
limit_mask -> limit as separate patch, ok?
								Pavel
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