[jdk21] RFR: 8311647: Memory leak in Java_jdk_internal_org_jline_terminal_impl_jna_linux_CLibraryImpl_ttyname_1r

[Aleksey Shipilev]

Clean backport to fix a memory leak introduced in JDK 21.

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Commit messages:
 - Backport 43099a85b16f036666d4e93106d2908ad75f9216

Changes: https://git.openjdk.org/jdk21/pull/126/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=126&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311647
  Stats: 2 lines in 2 files changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21/pull/126.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/126/head:pull/126

PR: https://git.openjdk.org/jdk21/pull/126