RFR: 8301189: validate-source fails after JDK-8298873

[Matthew Donovan]

fixed copyright header

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Commit messages:
 - added newline at end of file
 - 8301189: validate-source fails after JDK-8298873

Changes: https://git.openjdk.org/jdk/pull/12232/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12232&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301189
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12232.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12232/head:pull/12232

PR: https://git.openjdk.org/jdk/pull/12232