[issue1621] Do not assume signed integer overflow behavior

[Ismail Donmez]

Ismail Donmez added the comment:

For xmlparse.c compiler says :

Modules/expat/xmlparse.c:5337: warning: assuming signed overflow does
not occur when simplifying conditional to constant

Its impossible for j to overflow here due to name[i] check but I am not
sure what gcc is optimizing here.

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