[jdk8u] RFR: 8225687: Newly added sspi.cpp in JDK-6722928 still contains some small errors

[Alexey Bakhtin]

This is a follow-up fix for JDK-6722928.
Clean backport from JDK11

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Commit messages:
 - Backport e03c2a270b291e7b1edcf4df491d6d386a882a87

Changes: https://git.openjdk.org/jdk8u/pull/47/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u&pr=47&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8225687
  Stats: 127 lines in 3 files changed: 42 ins; 1 del; 84 mod
  Patch: https://git.openjdk.org/jdk8u/pull/47.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u.git pull/47/head:pull/47

PR: https://git.openjdk.org/jdk8u/pull/47