Clean up some Py_XDECREFs in rangeobject.c and bltinmodule.c

[zhangyangyu]

BPO	27342
Nosy	@rhettinger, @mdickinson, @serhiy-storchaka, @zhangyangyu
Files	cleanup_some_xdecrefs.patch cleanup_some_xdecrefs_v2.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2016-06-18.06:45:18.755>
created_at = <Date 2016-06-17.07:39:28.059>
labels = ['interpreter-core', 'type-feature']
title = 'Clean up some Py_XDECREFs in rangeobject.c and bltinmodule.c'
updated_at = <Date 2016-06-18.06:45:18.754>
user = 'https://github.com/zhangyangyu'

bugs.python.org fields:

activity = <Date 2016-06-18.06:45:18.754>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2016-06-18.06:45:18.755>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2016-06-17.07:39:28.059>
creator = 'xiang.zhang'
dependencies = []
files = ['43429', '43440']
hgrepos = []
issue_num = 27342
keywords = ['patch']
message_count = 5.0
messages = ['268711', '268724', '268729', '268744', '268768']
nosy_count = 5.0
nosy_names = ['rhettinger', 'mark.dickinson', 'python-dev', 'serhiy.storchaka', 'xiang.zhang']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue27342'
versions = ['Python 3.6']

[zhangyangyu]

Some Py_XDECREFs in rangeobject.c and bltinmodule.c are not necessary. Py_DECREF is enough. Clean up them.

[serhiy-storchaka]

Mostly good except longrangeiter_dealloc().

[zhangyangyu]

Thanks for review. Eliminate the wrongs ones.

[rhettinger]

v2 looks correct.

[python-dev]

New changeset 52931189d7ee by Serhiy Storchaka in branch 'default':
Issue bpo-27342: Replaced some Py_XDECREFs with Py_DECREFs.
https://hg.python.org/cpython/rev/52931189d7ee