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Fix signed-unsigned semantics in reduce_32

Heiko Lewin requested to merge hlewin/pixman:fix-scaling-test into master

This is the previous patch without any changes to the scaling test.

It fixes broken image sampling due to misinterpretation of signed values and an OOB write for scaling-factor=0 in pixman_filter_create_separable_convolution.

Fixes: #43 (closed)

Edited by Heiko Lewin

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