ole32: Fix reading from an HGLOBALStreamImpl with an invalid HGLOBAL.

[Robert Shearman]

Add tests that show the strange behaviour of IStream_Read returning S_OK 
instead of an error code.
---
  dlls/ole32/hglobalstream.c       |   13 +++++++++++
  dlls/ole32/tests/hglobalstream.c |   45 
++++++++++++++++++++++++++++++++++++++
  2 files changed, 58 insertions(+), 0 deletions(-)
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