[jdk17u-dev] RFR: 8282730: LdapLoginModule throw NPE from logout method after login failure

[Goetz Lindenmaier]

I backport this for parity with 17.0.6-oracle.

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Commit messages:
 - Backport 554f44ecb1134acff3eaf02e2e1c0e01158ab7e5

Changes: https://git.openjdk.org/jdk17u-dev/pull/802/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=802&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8282730
  Stats: 223 lines in 11 files changed: 151 ins; 2 del; 70 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/802.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/802/head:pull/802

PR: https://git.openjdk.org/jdk17u-dev/pull/802