d3d8: Fix typo in test.

[Huw Davies]

Fixes Valgrind warning:

 Conditional jump or move depends on uninitialised value(s)
    at  IsRectEmpty (uitools.c:1282)
    by  IntersectRect (uitools.c:1331)
    by  IWineD3DDeviceImpl_ClearSurface (device.c:5084)
    by  IWineD3DDeviceImpl_Clear (device.c:5155)
    by  IDirect3DDevice8Impl_Clear (device.c:895)
    by  clear_test (visual.c:309)
    by  func_visual (visual.c:1338)
    by  run_test (test.h:449)
    by  main (test.h:498)
  Uninitialised value was created by a stack allocation
    at  clear_test (visual.c:277)
---
 dlls/d3d8/tests/visual.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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