[jdk17] RFR: 8271223: two runtime/ClassFile tests don't check exit code

[Igor Ignatyev]

Hi all,

could you please review this small and trivial patch?

testing: `runtime/ClassFile` tests on `{linux,windows,macos}-x64`

Thanks,
-- Igor

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Commit messages:
 - copyright year
 - 8271223

Changes: https://git.openjdk.java.net/jdk17/pull/281/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17&pr=281&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271223
  Stats: 4 lines in 2 files changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/281.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/281/head:pull/281

PR: https://git.openjdk.java.net/jdk17/pull/281