RFR: 8320798: Console read line with zero out should zero out underlying buffer [v3]

[Matthias Baesken]

On Thu, 30 Nov 2023 17:39:30 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> It is best practice to zero out the underlying buffer after use.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove ensureOpen()

Marked as reviewed by mbaesken (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16861#pullrequestreview-1759751135