ole32: Add a check for NULL This->dataAdviseHolder in DefaultHandler_Stop.

[Robert Shearman]

Cleanup DefaultHandler_GetCanonicalFormatEtc by using 
This->pDataDelegate instead of querying for IDataObject from 
This->pOleDelegate.
---
  dlls/ole32/defaulthandler.c |   10 ++++------
  1 files changed, 4 insertions(+), 6 deletions(-)
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