[lworld] Integrated: 8350641: [lworld] NULL rather than nullptr still in Valhalla project repo

[David Simms]

Removed remaining "NULL"

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Commit messages:
 - 8350641: [lworld] NULL rather than nullptr still in Valhalla project repo

Changes: https://git.openjdk.org/valhalla/pull/1377/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1377&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350641
  Stats: 17 lines in 8 files changed: 0 ins; 0 del; 17 mod
  Patch: https://git.openjdk.org/valhalla/pull/1377.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1377/head:pull/1377

PR: https://git.openjdk.org/valhalla/pull/1377