[issue27660] Replace size_t with Py_ssize_t as the type of local variable in list_resize

[R. David Murray]

R. David Murray added the comment:

ob->allocated is temporarily set to -1 by list.sort to detect mutations, so the restriction of new_allocated to size_t is probably intentional.  If so, though, there ought to be a comment making that clear.

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nosy: +r.david.murray

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<http://bugs.python.org/issue27660>
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