Misc bugs found by using valgrind

[Michael Günnewig]

Shachar Shemesh <wine-devel at shemesh.biz> writes:

> Michael Günnewig wrote:
>
>>Changelog:
>>  Fixed use of uninitialized memory and wrong buffersize (found by valgrind).
...
> What are we doing to prevent integer overflow on these allocations?
> Shouldn't we, perhaps, use some wrapper that checks that
> "cbFilter*sizeof(WCHAR)" is not greater than "MAXINT"?

It's a point, so here is the new patch.

  Michael

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