fscrypt: Avoid dynamic allocation in fscrypt_get_devices()

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CVE-2026-68147: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: fscrypt: Avoid dynamic allocation in fscryptgetdevices When a blkcryptokey starts being used or is evicted, fs/crypto/ calls fscryptgetdevices to get the filesystem's list of block devices, then iterates over them and calls...