[issue1621] Do not assume signed integer overflow behavior

[Ismail Donmez]

Ismail Donmez added the comment:

Hah strlen in a loop, a nice beginner mistake but its 5.30 AM here so
please excuse me, Guido your version of course is way better. But with
that version compiler issues 

Modules/_csv.c:969: warning: assuming signed overflow does not occur when 
simplifying conditional to constant

again, strlen() just fooled that optimization it seems. So there should
be another way to optimize this loop.

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