spitz backlight: fix brightness limiting

[Pavel Machek]

On Thu 2009-10-22 04:20:34, 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?

Yes, the code was "interesting"...

I can certainly do the rename, but maybe we can fix the issue now and
do futher cleanups later?
								Pavel

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