Fix nextRangeU(0, MAX_UINT) div by zero.

Fix nextRangeU(0, MAX_UINT) div by zero.

R=reed@google.com
Committed: https://code.google.com/p/skia/source/detail?r=7400

[reed1, 2013-01-25 19:07:04]

Curious: do you find

range = max - min
0 == ~range
% (range + 1)

clearer to read than

range = max - min + 1
0 == range
% range

[bsalomon, 2013-01-25 19:17:08]

On 2013/01/25 19:07:04, reed1 wrote:
> Curious: do you find
> 
> range = max - min
> 0 == ~range
> % (range + 1)
> 
> clearer to read than
> 
> range = max - min + 1
> 0 == range
> % range

I dunno, doesn't really matter to me. I suppose the use of the word "range" in
the second version is more accurate.