oleaut32: Fix testing of HRESULT types with not operator instead of comparing against S_OK.

[Rob Shearman]

This makes it more obvious what the code is doing.
---
 dlls/oleaut32/variant.c |    4 ++--
 dlls/oleaut32/vartype.c |    4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)
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