Update code checks both non-null and instance of a class in security classes. The checks and explicit casts could also be replaced with pattern matching for the instanceof operator.
See similar cleanup in java.base - [JDK-8258422](https://bugs.openjdk.java.net/browse/JDK-8258422) ------------- Commit messages: - [PATCH] Cleanup unnecessary null comparison before instanceof check in security modules Changes: https://git.openjdk.org/jdk/pull/9284/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9284&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8289274 Stats: 94 lines in 14 files changed: 0 ins; 40 del; 54 mod Patch: https://git.openjdk.org/jdk/pull/9284.diff Fetch: git fetch https://git.openjdk.org/jdk pull/9284/head:pull/9284 PR: https://git.openjdk.org/jdk/pull/9284
