[gdiplus] GdipLoadImageFromStream: initialize variable

[Dan Kegel]

Iinitializing struct to zero fixes two warnings:

  Conditional jump or move depends on uninitialised value(s)
    at  GetDIBits (dib.c:623)
    by  GdipLoadImageFromStream (image.c:769)
    by  GdipLoadImageFromFile (image.c:722)
    by  func_image (image.c:172)
    by  run_test (test.h:406)
    by  main (test.h:455)

 Conditional jump or move depends on uninitialised value(s)
    at  X11DRV_DIB_GetImageBits_24 (dib.c:2779)
    by  X11DRV_DIB_GetImageBits (dib.c:3751)
    by  X11DRV_GetDIBits (dib.c:4142)
    by  GetDIBits (dib.c:1043)
    by  GdipBitmapLockBits (image.c:144)
    by  test_LockBits (image.c:256)
    by  func_image (image.c:437)
    by  run_test (test.h:406)
    by  main (test.h:455)
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