[Image-SIG] PIL crash bug sharpening

[Daniel Fetchinson]

> PIL will cause a crash in python.exe when sharpening very small images.
>
> Repro:
>
> img = PImage.new('RGB', (1, 1))
> img = PImageEnhance.Sharpness(img).enhance(1.5)

I can confirm this on linux x86_64, python 2.5.1, PIL 1.1.6. The above
segfaults python.

Cheers,
Daniel



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