advapi32: Fix potential NULL pointer dereference in LookupPrivilegeNameW [with test] (Saturn)

[Aurimas Fišeras]

Saturn's error report:
__arg2 of function wine-git/include/wine/unicode.h:strcpyW can evaluate
to NULL LookupPrivilegeNameW (1762:security.c),
wine-git/include/wine/unicode.h:strcpyW (1854:security.c), final site of
dereference is: (224:wine-git/include/wine/unicode.h)

Tested on Windows XP

Changelog:
    advapi32: Fix potential NULL pointer dereference in
LookupPrivilegeNameW [with test] (Saturn)


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