Patch for KisBrush::scaleImage

[Sven Langkamp]

Hi,

I have been trying to investigate
https://bugs.kde.org/show_bug.cgi?id=229512
I have attached a patch from which I think that it fixes the crash, though
I'm not sure as I don't completely grasp it and therefor post of for review.

Without the patch it might happen that we pass a negative index to scanline.



Sven
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