[crac] RFR: 8348927: [CRaC] Handle boot-id not ending with newline

[duke]

On Wed, 29 Jan 2025 07:38:02 GMT, Timofei Pushkin <tpushkin at openjdk.org> wrote:

> Besides fixing the problem described in the JDK issue:
> - Report errors through `log_error(crac)`, not `perror()`
> - Don't leak a file descriptor on error

@TimPushkin 
Your change (at version def793244ed0b715553fe5c11d00f8acc25ca2cd) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/crac/pull/196#issuecomment-2626463279