8284680: sun.font.FontConfigManager.getFontConfig() leaks charset

[zhengyu123]

A clean backport to fix memory leaks.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8284680: sun.font.FontConfigManager.getFontConfig() leaks charset

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk18u pull/150/head:pull/150
$ git checkout pull/150

Update a local copy of the PR:
$ git checkout pull/150
$ git pull https://git.openjdk.java.net/jdk18u pull/150/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 150

View PR using the GUI difftool:
$ git pr show -t 150

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk18u/pull/150.diff

[bridgekeeper]

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[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

@zhengyu123 This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8284680: sun.font.FontConfigManager.getFontConfig() leaks charset

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[mlbridge]

Webrevs

• 00: Full (ab038771)

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