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

[Kirill K. Smirnov]

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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diff --git a/dlls/gdiplus/image.c b/dlls/gdiplus/image.c
index 9516d64..c6b56bd 100644
--- a/dlls/gdiplus/image.c
+++ b/dlls/gdiplus/image.c
@@ -253,6 +253,7 @@ GpStatus WINGDIPAPI GdipCloneImage(GpImage *image, GpImage **cloneImage)
     IStream* stream;
     HRESULT hr;
     INT size;
+    LARGE_INTEGER move;
 
     TRACE("%p, %p\n", image, cloneImage);
 
@@ -279,6 +280,12 @@ GpStatus WINGDIPAPI GdipCloneImage(GpImage *image, GpImage **cloneImage)
         goto out;
     }
 
+    /* Set seek pointer back to the beginning of the picture */
+    move.QuadPart = 0;
+    hr = IStream_Seek(stream, move, STREAM_SEEK_SET, NULL);
+    if (FAILED(hr))
+        goto out;
+
     hr = OleLoadPicture(stream, size, FALSE, &IID_IPicture,
             (LPVOID*) &(*cloneImage)->picture);
     if (FAILED(hr))