advpack: don't close a handle if it wasn't opened (resend)

[Dan Kegel]

Avoids referencing an undefined variable.

Fixes valgrind warning:

  Conditional jump or move depends on uninitialised value(s)
    at  RegCloseKey (registry.c:916)
    by  get_dest_dir (advpack.c:105)
    by  set_ldids (advpack.c:171)
    by  TranslateInfStringW (advpack.c:749)
    by  TranslateInfStringA (advpack.c:673)
    by  translateinfstring_test (advpack.c:291)
  Uninitialised value was created by a stack allocation
    at  get_dest_dir (advpack.c:69)
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