_hashopenssl has reference leaks in OOM case

BPO	36179
Nosy	@gpshead, @tiran, @stratakis, @miss-islington, @iritkatriel
PRs	bpo-36179: Fix ref leaks in _hashopenssl #12158 [3.7] bpo-36179: Fix ref leaks in _hashopenssl (GH-12158) #12164 [3.6] bpo-36179: Fix ref leaks in _hashopenssl (GH-12158) #12165 [2.7] bpo-36179: Fix ref leaks in _hashopenssl (GH-12158) #12166

^{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 = 'https://github.com/tiran'
closed_at = <Date 2020-10-17.06:26:39.196>
created_at = <Date 2019-03-04.09:41:10.547>
labels = ['extension-modules', '3.7', '3.8', 'performance']
title = '_hashopenssl has reference leaks in OOM case'
updated_at = <Date 2020-10-17.06:26:39.196>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2020-10-17.06:26:39.196>
actor = 'gregory.p.smith'
assignee = 'christian.heimes'
closed = True
closed_date = <Date 2020-10-17.06:26:39.196>
closer = 'gregory.p.smith'
components = ['Extension Modules']
creation = <Date 2019-03-04.09:41:10.547>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 36179
keywords = ['patch']
message_count = 5.0
messages = ['337087', '337133', '337137', '337140', '378766']
nosy_count = 5.0
nosy_names = ['gregory.p.smith', 'christian.heimes', 'cstratak', 'miss-islington', 'iritkatriel']
pr_nums = ['12158', '12164', '12165', '12166']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'resource usage'
url = 'https://bugs.python.org/issue36179'
versions = ['Python 2.7', 'Python 3.7', 'Python 3.8']