gh-116404: Handle errors correctly in wait_helper in posixmodule

[sobolevn]

This would need backports to 3.12 and 3.11: https://github.com/python/cpython/blob/3.11/Modules/posixmodule.c#L8395-L8426

I've also noticed really strange refleak output (it is the same before and after):

» ./python.exe -m test -R 3:3 test_wait4 test_wait3 
Using random seed: 3926646517
0:00:00 load avg: 1.33 Run 2 tests sequentially
0:00:00 load avg: 1.33 [1/2] test_wait4
beginning 6 repetitions. Showing number of leaks (. for 0 or less, X for 10 or more)
123:456
XX. .1.
test_wait4 leaked [-1, 1, 0] memory blocks, sum=0 (this is fine)
0:00:30 load avg: 1.71 [2/2] test_wait3 -- test_wait4 passed in 30.5 sec
beginning 6 repetitions. Showing number of leaks (. for 0 or less, X for 10 or more)
123:456
XX. ...
test_wait3 passed in 30.6 sec

== Tests result: SUCCESS ==

All 2 tests OK.

Total duration: 1 min 1 sec
Total tests: run=5
Total test files: run=2/2
Result: SUCCESS

• Issue: Handle errors correctly in wait_helper in posixmodule.c #116404

[miss-islington-app]

Thanks @sobolevn for the PR 🌮🎉.. I'm working now to backport this PR to: 3.11, 3.12.
🐍🍒⛏🤖

[bedevere-app]

GH-116406 is a backport of this pull request to the 3.12 branch.

[bedevere-app]

GH-116407 is a backport of this pull request to the 3.11 branch.