[issue27342] Clean up some Py_XDECREFs in rangeobject.c and bltinmodule.c

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Mostly good except longrangeiter_dealloc().

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components: +Interpreter Core
nosy: +mark.dickinson
stage:  -> patch review
type:  -> enhancement
versions: +Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27342>
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