CVE-2026-53163 locking/rtmutex: Skip remove_waiter() when waiter is not enqueued

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/locking/rtmutex.c",
      "kernel/locking/rtmutex_api.c"
    ],
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      {
        "version": "6.1.175",
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      {
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    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
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      "kernel/locking/rtmutex_api.c"
    ],
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      {
        "version": "7.0.4",
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      }
    ]
  }
]