fixup! Initial support for dehydrated devices

Author: poljar

crates/matrix-sdk-crypto/src/dehydrated_devices.rs

@@ -341,12 +341,11 @@ impl DehydratedDevice {
 ///
 /// To combat the IV reuse, we're going to create a per-dehydrated-device unique
 /// pickle key by expanding the key itself with the device ID used as the salt.
-///
-/// TODO: Perhaps we should put this into vodozemac with a new pickle
-/// minimalistic pickle format using the [`matrix_pickle`] crate.
-///
-/// [`matrix_pickle`]: https://docs.rs/matrix-pickle/latest/matrix_pickle/
 fn expand_pickle_key(key: &[u8; 32], device_id: &DeviceId) -> Box<[u8; 32]> {
+    // TODO: Perhaps we should put this into vodozemac with a new pickle
+    // minimalistic pickle format using the [`matrix_pickle`] crate.
+    //
+    // [`matrix_pickle`]: https://docs.rs/matrix-pickle/latest/matrix_pickle/
     let kdf: Hkdf<Sha256> = Hkdf::new(Some(device_id.as_bytes()), key);
     let mut key = Box::new([0u8; 32]);