ole32: Add validation of parameters to CoGetClassObject and make sure to initialise ppv to NULL.

[Robert Shearman]

---
  dlls/ole32/compobj.c       |   11 +++++++++++
  dlls/ole32/tests/compobj.c |   12 ++++++++++++
  2 files changed, 23 insertions(+), 0 deletions(-)
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