ntdll: More error checking. Properly handle NULL ACLs.

[Vitaliy Margolen]

Thanks Dan for excellent troubleshooting in bug 7567.
NULL ACLs are valid and mean "default ACL from the token".

---
 dlls/advapi32/tests/security.c |    7 +++++++
 dlls/ntdll/sec.c               |   19 ++++++++++++-------
 2 files changed, 19 insertions(+), 7 deletions(-)
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