CVE-2025-40178 pid: Add a judgment for ns null in pid_nr_ns

[
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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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    ],
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    "programFiles": [
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      {
        "version": "0",
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        "versionType": "semver"
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      {
        "version": "5.4.301",
        "lessThanOrEqual": "5.4.*",
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      {
        "version": "5.10.246",
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]