Fix AllowedMechanisms issue

[ionut-arm]

No description provided.

[Jakuje]

Gemini suggests to copy the packed member before comparing to avoid accessing unaligned struct members of packed structure:

    let raw_type = raw.type_;
    let raw_len = raw.ulValueLen;

    // Assert against the local, properly aligned variables
    assert_eq!(raw_type, CKA_ALLOWED_MECHANISMS);
    assert_eq!(
        raw_len as usize,
        mechanisms.len() * size_of::<CK_MECHANISM_TYPE>()
    );

or you can force a copy by wrapping the field accesses in a block expression:

assert_eq!({ raw.type_ }, CKA_ALLOWED_MECHANISMS);

Otherwise looks good!