[PATCH] wined3d: Ignore clears if count = 0 and rects != NULL

[Stefan Dösinger]

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Am 2013-01-23 13:28, schrieb Henri Verbeet:
> Although I don't expect a difference in behaviour, it probably 
> wouldn't hurt to add tests for the other ddraw versions as well
> (i.e. through the viewport interface).
I was under the assumption that we already had a test for that - those
interfaces expect both count and rectangle to be non-zero, otherwise
they return an error.

I can't find the test right now, so it seems that assumption was wrong.

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