[lworld] RFR: 8378186: [lworld] Assign default values and minor cleanup

[Dan Heidinga]

This provides a default value for some locals so it's obvious they are always set and does some minor cleanup.

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Commit messages:
 - 8378186: [lworld] Assign default values and minor cleanup

Changes: https://git.openjdk.org/valhalla/pull/2130/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2130&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378186
  Stats: 9 lines in 2 files changed: 5 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/valhalla/pull/2130.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2130/head:pull/2130

PR: https://git.openjdk.org/valhalla/pull/2130