ntdll/tests: Clarify ok() conditions (PVS-Studio)

[André Hentschel]

remaining from https://bugs.winehq.org/show_bug.cgi?id=37127
---
 dlls/ntdll/tests/string.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)


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