[advapi32/tests] fix possible NULL pointer dereference

[Stefan Leichter]

fixes the crash 
http://test.winehq.org/data/1262f07609e6722a841f511445f145d941848800/linux_arm-
sle85276/advapi32:cred.html

---
 dlls/advapi32/tests/cred.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)

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