RFR: CODETOOLS-7902835: JOL: ObjectShapes.processJAR should close resources properly

[Aleksey Shipilev]

SonarCloud instance reports a few easy-to-fix issues in this method.

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

Commit messages:
 - Fix whitespace
 - CODETOOLS-7902835: JOL: ObjectShapes.processJAR should close resources properly

Changes: https://git.openjdk.java.net/jol/pull/9/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jol&pr=9&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902835
  Stats: 7 lines in 1 file changed: 0 ins; 3 del; 4 mod
  Patch: https://git.openjdk.java.net/jol/pull/9.diff
  Fetch: git fetch https://git.openjdk.java.net/jol pull/9/head:pull/9

PR: https://git.openjdk.java.net/jol/pull/9