off by one error, maxpins

[Sean Bruno]

On Thu, 2013-09-05 at 16:42 -0600, Warner Losh wrote:
> Shouldn't npins and/or maxpin just be bumped by 1 instead?
> 
> Warner
> 
> On Sep 5, 2013, at 4:38 PM, Sean Bruno wrote:
> 
> > http://people.freebsd.org/~sbruno/maxpin_plus_one.txt
> > 

It looks like its  *intentionally* assigned as the h/w specific (GPIO
COUNT) -1 in ar71xx_gpio_pin_max()

Userland assumes that this value is a 0-based thing.  
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