[OLE #120] Fix Some Storage Error Cases

[Robert Shearman]

Changelog:
- Initialize out pointer to NULL before access check in 
IStorage_CreateStorage.
- WriteClassStg should return E_INVALIDARG if pstg is NULL instead of 
asserting.
- ReadClassStg should return E_INVALIDARG if pstg is NULL instead of 
crashing and a NULL pclsid should cause it to return the same value.

-- 
Rob Shearman

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