[lworld] RFR: 8267559: [lworld] [lw3] NPE thrown when attempting to write null to a null-free array has incorrect error message

[Frederic Parain]

Please review this small fix in the error message of the NullPointerException thrown when trying to write null on a null-free array.

Thank you,

Fred

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Commit messages:
 - Fix NPE error message for null-free arrays

Changes: https://git.openjdk.java.net/valhalla/pull/422/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=422&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267559
  Stats: 7 lines in 1 file changed: 6 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/422.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/422/head:pull/422

PR: https://git.openjdk.java.net/valhalla/pull/422