[PATCH] ntdll/tests: Fix a string leak (Valgrind).

[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=53154

Your paranoid android.


=== debian9 (32 bit report) ===

ntdll:
om.c:2118: Test failed: got 99
om.c:2133: Test failed: got 99
om.c:2133: Test failed: got 99

=== debian9 (32 bit French report) ===

ntdll:
om.c:2118: Test failed: got 99
om.c:2133: Test failed: got 99

=== debian9 (32 bit Japanese:Japan report) ===

ntdll:
om.c:2133: Test failed: got 99

=== debian9 (32 bit Chinese:China report) ===

ntdll:
om.c:2133: Test failed: got 99

=== debian9 (32 bit WoW report) ===

ntdll:
om.c:2133: Test failed: got 99
om.c:2133: Test failed: got 99

=== debian9 (64 bit WoW report) ===

ntdll:
om.c:2118: Test failed: got 99
om.c:2133: Test failed: got 99