Refleak in posix_spawn

[zware]

BPO	33191
Nosy	@gpshead, @vstinner, @ned-deily, @zware, @pablogsal
PRs	bpo-33191: Fix refleak in posix_spawn #6315 bpo-33191: Fix refleaks, style and other issues for os.posix_spawn #6331
Superseder	bpo-20104: expose posix_spawn(p)

^{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 2018-05-01.20:08:48.561>
created_at = <Date 2018-03-30.21:09:31.790>
labels = ['interpreter-core', '3.7', '3.8']
title = 'Refleak in posix_spawn'
updated_at = <Date 2018-05-01.20:08:48.560>
user = 'https://github.com/zware'

bugs.python.org fields:

activity = <Date 2018-05-01.20:08:48.560>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2018-05-01.20:08:48.561>
closer = 'ned.deily'
components = ['Interpreter Core']
creation = <Date 2018-03-30.21:09:31.790>
creator = 'zach.ware'
dependencies = []
files = []
hgrepos = []
issue_num = 33191
keywords = ['patch']
message_count = 2.0
messages = ['314719', '314785']
nosy_count = 5.0
nosy_names = ['gregory.p.smith', 'vstinner', 'ned.deily', 'zach.ware', 'pablogsal']
pr_nums = ['6315', '6331']
priority = 'critical'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '20104'
type = None
url = 'https://bugs.python.org/issue33191'
versions = ['Python 3.7', 'Python 3.8']

[zware]

There is a refleak in posix_spawn; see for example http://buildbot.python.org/all/#/builders/114/builds/53

The attached PR fixes it, but I am not confident that I did it correctly.

[gpshead]

#6332 appears to address this.