[d3d9/tests] Correct the size of a memcmp

[Paul Vriens]

Hi,

After fixing the size of the memcmp, Henri mentioned:

 > I think that should be "num_elements * sizeof(*vertex_decl)" even.

Looking at the HeapAlloc above and the declaration of simple_decl, that 
makes sense.

Changelog
   Correct the size of a memcmp

-- 
Cheers,

Paul.
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