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

[Stefan Dösinger]

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Am 2013-01-23 13:36, schrieb Stefan D￶singer:
> 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.
Found them on my pile of half-finished viewport tests I postponed for
Wine 1.4...
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