[PATCH 6/6] ntdll: Fix IOCTL_DVD_READ_STRUCTURE parameter checking and output format

[Dan Kegel]

The output buffer always starts with _DVD_DESCRIPTOR_HEADER.
See http://bugs.winehq.org/show_bug.cgi?id=29669

Also fixed a few other things found by the conformance test:
odd length output buffers are not allowed,
partial output buffers are allowed, and
overly long output buffers are zero-filled on the end up to offset 2052.

Not yet tested on macosx.
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