RFR: 2239: Stop logging "issue: bad whitespace"

[Zhao Song]

There is no point to log "issue: bad whitespace" in whitespace jcheck.

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Commit messages:
 - SKARA-2239

Changes: https://git.openjdk.org/skara/pull/1640/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1640&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2239
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/skara/pull/1640.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1640/head:pull/1640

PR: https://git.openjdk.org/skara/pull/1640