ole32: Add tests for the failure cases of CLSIDFromProgID and fix the function to conform to these.

[Robert Shearman]

---
  dlls/ole32/compobj.c       |   18 ++++++++++++++----
  dlls/ole32/tests/compobj.c |   14 ++++++++++++++
  2 files changed, 28 insertions(+), 4 deletions(-)
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