RFR: 8275918: Remove unused local variables in java.base security code

[Andrey Turbanov]

Cleanup unused local variables. Looks like they are leftovers after refactoring.

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Commit messages:
 - [PATCH] Remove unused local variables in java.base security code

Changes: https://git.openjdk.java.net/jdk/pull/6092/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6092&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275918
  Stats: 31 lines in 13 files changed: 0 ins; 16 del; 15 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6092.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6092/head:pull/6092

PR: https://git.openjdk.java.net/jdk/pull/6092