[PATCH v2] shlwapi/tests: Document where SHFormatDateTimeA() crashes for NULL pointers.

[Marvin]

Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=96996

Your paranoid android.


=== debiant2 (32 bit Hindi:India report) ===

shlwapi:
ordinal.c:1724: Test failed: expected ( ), got (02:32)
ordinal.c:1731: Test failed: expected ( ), got (02:32:07)
ordinal.c:1739: Test failed: expected ( ), got (02:32:07)
ordinal.c:1746: Test failed: expected ( ), got (01-09-2021)
ordinal.c:1753: Test failed: expected ( ), got (01 ??????? 2021)
ordinal.c:1761: Test failed: expected ( ), got (01 ??????? 2021)
ordinal.c:1769: Test failed: expected (F), got (2) for time part
ordinal.c:1783: Test failed: expected (F), got (7) for time part
ordinal.c:1801: Test failed: expected (  F), got (01-09-2021 02:32)
ordinal.c:1812: Test failed: expected (  F F), got (01-09-2021 02:32:07)