message: Simplify / re-use var names
diff: @@ -290,11 +290,11 @@ mod tests {
  public_keys.push(public_key);
  }
  - let message_slices: Vec<&[u8]> = messages.iter().map(|m| m.as_slice()).collect();
  - let signature_slices: Vec<&[u8]> = signatures.iter().map(|m| m.as_slice()).collect();
  - let pubkey_slices: Vec<&[u8]> = public_keys.iter().map(|m| m.as_slice()).collect();
  + let messages: Vec<&[u8]> = messages.iter().map(|m| m.as_slice()).collect();
  + let signatures: Vec<&[u8]> = signatures.iter().map(|m| m.as_slice()).collect();
  + let pubkeys: Vec<&[u8]> = public_keys.iter().map(|m| m.as_slice()).collect();
  // ed25519_batch_verify() works
  - assert!(ed25519_batch_verify(&message_slices, &signature_slices, &pubkey_slices).unwrap());
  + assert!(ed25519_batch_verify(&messages, &signatures, &pubkeys).unwrap());
  }
  }
  