CVE-2026-46164 btrfs: fix double free in create_space_info_sub_group() error path

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/btrfs/space-info.c"
    ],
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        "versionType": "original_commit_for_fix"
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  }
]