shlwapi: 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/shlwapi/ordinal.c |    6 +++---
 dlls/shlwapi/string.c  |    8 +++++---
 dlls/shlwapi/url.c     |    2 +-
 3 files changed, 9 insertions(+), 7 deletions(-)
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