off by one error, maxpins

[Sean Bruno]

http://people.freebsd.org/~sbruno/maxpin_plus_one.txt

Been screwing around with pins and led's on the DIR-825 B1.  Looks like
it has an led on PIN 11, its "maxpin" is 11 when its setup at
initialization.  This is causing the *last* gpio pin to be ignored.

e.g.
--original--
# gpioctl -f /dev/gpioc0 -l

pin 00: 0       pin 0<OUT>
pin 01: 0       pin 1<OUT>
pin 02: 0       pin 2<OUT>
pin 03: 1       pin 3<OUT>
pin 04: 0       pin 4<OUT>
pin 05: 1       pin 5<IN>
pin 06: 0       pin 6<OUT>
pin 07: 1       pin 7<IN>
pin 08: 0       pin 8<OUT>


--patch--
# gpioctl -f /dev/gpioc0 -l
pin 00: 0       pin 0<OUT>
pin 01: 0       pin 1<OUT>
pin 02: 0       pin 2<OUT>
pin 03: 1       pin 3<OUT>
pin 04: 0       pin 4<OUT>
pin 05: 1       pin 5<IN>
pin 06: 0       pin 6<OUT>
pin 07: 1       pin 7<IN>
pin 08: 0       pin 8<OUT>
pin 11: 0       pin 11<OUT>

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