[gl2ps] typo in gl2psRescaleAndOffset

[Alexander Danilov]

Hello,

I tried to use GL2PS_POLYGON_OFFSET_FILL feature, but the picture was
very ugly. I went through gl2ps.c and find some strange thing in
gl2psRescaleAndOffset function:
dZdX is supposed to be (a*d-b*c)/area, but it is only a*d - b*c/area,
the same thing goes with dZdY. I am not sure if the formula is correct,
but when I fixed this, pictures became much better :)

I attached the patch to explain what I fixed.

Alexander
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