[jdk21u-dev] RFR: 8316895: SeenThread::print_action_queue called on a null pointer

[Matthias Baesken]

8316895: SeenThread::print_action_queue called on a null pointer

-------------

Commit messages:
 - Backport fd52be2a3c53912598afe600d680de77090f9f43

Changes: https://git.openjdk.org/jdk21u-dev/pull/927/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=927&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316895
  Stats: 5 lines in 1 file changed: 0 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/927.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/927/head:pull/927

PR: https://git.openjdk.org/jdk21u-dev/pull/927