advapi32 tests: fix memory leak (found by Smatch). [2/3]

[Lionel_Debroux]

test_AccessCheck leaks some heap memory in three error paths. Found in 
Michael Stefaniuc's list of Wine potential bugs detected by Smatch.

2007-10-02  Lionel Debroux <lionel_debroux at yahoo.fr>
        * dlls/advapi32/tests/security.c:
        advapi32 tests: fix memory leak (found by Smatch).

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