CVE-2025-21858 geneve: Fix use-after-free in geneve_find_dev().

[
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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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      "drivers/net/geneve.c"
    ],
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    "programFiles": [
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      {
        "version": "0",
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        "versionType": "semver"
      },
      {
        "version": "5.4.291",
        "lessThanOrEqual": "5.4.*",
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      },
      {
        "version": "5.10.235",
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      {
        "version": "5.15.179",
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      {
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      {
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]