[issue27073] redundant checks in long_add and long_sub

[Oren Milman]

Oren Milman added the comment:

And after quadruple checking myself, I found a foolish mistake - in that flow, x_add received at least one multiple-digit int (not necessarily two :().

I fixed that mistake in the comment. The updated diff file is attached.

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Added file: http://bugs.python.org/file43045/issue27073.diff

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