unicode: free the map after a grace period

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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
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                    "vendor": "Linux",
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/unicode/utf8-core.c",
                        "include/linux/unicode.h"
                    ],
                    "versions": [
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                            "version": "5.2",
                            "status": "affected"
                        },
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                            "version": "0",
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                            "versionType": "original_commit_for_fix"
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                }