libceph: factor out __ceph_x_decrypt()
Will be used for decrypting the server challenge which is only preceded by ceph_x_encrypt_header. Drop struct_v check to allow for extending ceph_x_encrypt_header in the future. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Sage Weil <sage@redhat.com>
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