gdiplus: IPicture_SaveAsFile updates seek pointer, so put it back.

[Nikolay Sivov]

It isn't obvious (your patch fot ret value). Why are you hiding all
codes except E_FAIL? Tests are needed, but I think you're hiding
something by this change.

On 10/16/08, Kirill K. Smirnov <lich at math.spbu.ru> wrote:
> This patch fixes gdiplus test failures revealed by patch:
> [2/3] oleaut32: return correct error code
> http://www.winehq.org/pipermail/wine-patches/2008-October/063221.html
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