ole32: CoCreateGuid returns E_INVALIDARG on null-GUID

[Guillaume Charifi]

Another Windows unspecified behaviour...
CoCreateGuid(NULL) returns E_INVALIDARG, whereas UuidCreate(NULL) crashes the program as expected.

---
 dlls/ole32/compobj.c       | 6 +++++-
 dlls/ole32/tests/compobj.c | 9 +++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)
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