fscrypt: Add missing superblock check in find_or_insert_direct_key()

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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/crypto/keysetup_v1.c"
                    ],
                    "versions": [
                        {
                            "version": "6.1",
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                        },
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                        {
                            "version": "6.1.183",
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                        },
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                            "version": "6.18.42",
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                }