CVE-2026-64452 6lowpan: fix NHC entry use-after-free on error path

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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      },
      {
        "version": "0",
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        "versionType": "semver"
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      {
        "version": "5.10.261",
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      {
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        "version": "7.2-rc1",
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]