shlwapi/tests: Standardize the COM usage in ordinal.c.

[Marvin]

Hi,

While running your changed tests on Windows, 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
http://testbot.winehq.org/JobDetails.pl?Key=7586

Your paranoid android.


=== W7PRO (32 bit ordinal) ===
ordinal.c:1824: Test failed: got 30
ordinal.c:1839: Test failed: got 10
ordinal.c:1852: Test failed: got 13
ordinal.c:1860: Test failed: got 13
ordinal.c:1867: Test failed: got 13
ordinal.c:1874: Test failed: got 30
ordinal.c:1882: Test failed: got 30
ordinal.c:1890: Test failed: got 42, length 43
ordinal.c:1901: Test failed: got 45
ordinal.c:1912: Test failed: got 24
ordinal.c:1923: Test failed: got 27