Fixed multiple clippy warnings.

src/crypto/chacha.rs

@@ -23,12 +23,12 @@ impl Chacha {
     }
 
     pub fn encrypt(&self, data: &[u8]) -> Result<Vec<u8>, Error> {
-        let nonce = Nonce::from(self.nonce.clone());
+        let nonce = Nonce::from(self.nonce);
         self.cipher.encrypt(&nonce, data.as_ref())
     }
 
     pub fn decrypt(&self, data: &[u8]) -> Result<Vec<u8>, Error> {
-        let nonce = Nonce::from(self.nonce.clone());
+        let nonce = Nonce::from(self.nonce);
         self.cipher.decrypt(&nonce, data.as_ref())
     }
 

src/crypto/crypto_box.rs

@@ -46,7 +46,7 @@ impl CryptoBox {
 
     pub fn decrypt(secret: &[u8], message: &[u8]) -> Result<Vec<u8>, Error> {
         let secret = SecretKey::from_bytes(secret).unwrap();
-        decrypt(&secret, &message)
+        decrypt(&secret, message)
     }
 }