gdiplus: Avoid not necessary memory allocation for BITMAPINFO.

dlls/gdiplus/image.c

@@ -1821,7 +1821,6 @@ static GpStatus get_screen_resolution(REAL *xres, REAL *yres)
 GpStatus WINGDIPAPI GdipCreateBitmapFromScan0(INT width, INT height, INT stride,
     PixelFormat format, BYTE* scan0, GpBitmap** bitmap)
 {
-    BITMAPINFO* pbmi;
     HBITMAP hbitmap=NULL;
     INT row_size, dib_stride;
     BYTE *bits=NULL, *own_bits=NULL;
@@ -1851,9 +1850,8 @@ GpStatus WINGDIPAPI GdipCreateBitmapFromScan0(INT width, INT height, INT stride,
 
     if (format & PixelFormatGDI && !(format & (PixelFormatAlpha|PixelFormatIndexed)) && !scan0)
     {
-        pbmi = GdipAlloc(sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD));
-        if (!pbmi)
-            return OutOfMemory;
+        char bmibuf[FIELD_OFFSET(BITMAPINFO, bmiColors[256])];
+        BITMAPINFO *pbmi = (BITMAPINFO *)bmibuf;
 
         pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
         pbmi->bmiHeader.biWidth = width;
@@ -1870,8 +1868,6 @@ GpStatus WINGDIPAPI GdipCreateBitmapFromScan0(INT width, INT height, INT stride,
 
         hbitmap = CreateDIBSection(0, pbmi, DIB_RGB_COLORS, (void**)&bits, NULL, 0);
 
-        GdipFree(pbmi);
-
         if (!hbitmap) return GenericError;
 
         stride = dib_stride;