CVE-2025-37915 net_sched: drr: Fix double list add in class with netem as child qdisc

[
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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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      "net/sched/sch_drr.c"
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      {
        "version": "0",
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        "versionType": "semver"
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      {
        "version": "5.4.294",
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      {
        "version": "5.10.238",
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]