advpack: Add explicit "!= S_OK" to expressions that use HRESULTs as booleans.

[Rob Shearman]

---
 dlls/advpack/files.c   |    2 +-
 dlls/advpack/install.c |    6 +++---
 dlls/advpack/reg.c     |    2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)
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