ntdll: RtlCreateAcl: initialize all the bytes passed by the user

[Dan Kegel]

Without this patch, NtAccessCheck() references uninitialized
memory (it seems to send the entire ACL with the user's
length to the server, not just sizeof(ACL)).  This showed up as
valgrind errors when running "make test" in advapi32.
I suppose the right fix might be to send just sizeof(ACL) bytes
to the server, but I wouldn't know, and initializing all
the bytes given by the caller seems innocuous enough.

Also fix a probably level-of-indirection thinko in a TRACE
that causes a valgrind error with +ntdll.
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