[jdk21u-dev] RFR: 8320798: Console read line with zero out should zero out underlying buffer

[Goetz Lindenmaier]

This issue should be fixed in 21, too.

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Commit messages:
 - Backport d568562966e9a2020704eee3d67b8a106f647d9c

Changes: https://git.openjdk.org/jdk21u-dev/pull/3/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=3&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320798
  Stats: 30 lines in 2 files changed: 29 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/3.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/3/head:pull/3

PR: https://git.openjdk.org/jdk21u-dev/pull/3