bpo-38270: Fix indentation of test_hmac assertions

[stratakis]

Since c64a1a6 two assertions were indented and thus ignored when running test_hmac.

This PR fixes it. As the change is quite trivial I didn't add a NEWS entry.

https://bugs.python.org/issue38270

Automerge-Triggered-By: @tiran

[stratakis]

cc @tiran

[miss-islington]

Sorry, I can't merge this PR. Reason: Base branch was modified. Review and try the merge again..

[miss-islington]

Thanks @stratakis for the PR 🌮🎉.. I'm working now to backport this PR to: 3.8.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

[bedevere-bot]

GH-17450 is a backport of this pull request to the 3.8 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Windows7 SP1 3.x has failed when building commit 8943318.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/81/builds/8) and take a look at the build logs.
4. Check if the failure is related to this commit (8943318) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/81/builds/8

Failed tests:

• test_regrtest

Summary of the results of the build (if available):

== Tests result: FAILURE then SUCCESS ==

387 tests OK.

10 slowest tests:

• test_multiprocessing_spawn: 2 min 47 sec
• test_unparse: 1 min 48 sec
• test_tokenize: 1 min 47 sec
• test_concurrent_futures: 1 min 33 sec
• test_capi: 1 min 13 sec
• test_lib2to3: 1 min 13 sec
• test_unicodedata: 1 min 10 sec
• test_io: 1 min 6 sec
• test_asyncio: 1 min 3 sec
• test_mmap: 1 min 2 sec

33 tests skipped:
test_curses test_dbm_gnu test_dbm_ndbm test_devpoll test_epoll
test_fcntl test_fork1 test_gdb test_grp test_ioctl test_kqueue
test_multiprocessing_fork test_multiprocessing_forkserver test_nis
test_openpty test_ossaudiodev test_pipes test_poll test_posix
test_pty test_pwd test_readline test_resource test_spwd
test_syslog test_threadsignals test_tix test_tk test_ttk_guionly
test_wait3 test_wait4 test_xxtestfuzz test_zipfile64

1 re-run test:
test_regrtest

Total duration: 18 min 3 sec

Click to see traceback logs

Traceback (most recent call last):
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\support\__init__.py", line 380, in _force_run
    return func(*args)
PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\buildbot.python.org\\3.x.kloth-win64\\build\\build\\test_python_7324\\test_python_worker_7004'


Traceback (most recent call last):
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\support\__init__.py", line 1093, in temp_dir
    yield path
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\support\__init__.py", line 1145, in temp_cwd
    yield cwd_dir
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\libregrtest\main.py", line 634, in main
    self._main(tests, kwargs)
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\libregrtest\main.py", line 707, in _main
    sys.exit(0)
SystemExit: 0


Traceback (most recent call last):
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\runpy.py", line 193, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\__main__.py", line 2, in <module>
    main()
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\libregrtest\main.py", line 712, in main
    Regrtest().main(tests=tests, **kwargs)
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\libregrtest\main.py", line 634, in main
    self._main(tests, kwargs)
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\contextlib.py", line 131, in __exit__
    self.gen.throw(type, value, traceback)
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\support\__init__.py", line 1145, in temp_cwd