Fix clippy warning (#755)

actix-http/src/body.rs

@@ -359,7 +359,7 @@ where
     }
 
     fn poll_next(&mut self) -> Poll<Option<Bytes>, Error> {
-        self.stream.poll().map_err(|e| e.into())
+        self.stream.poll().map_err(std::convert::Into::into)
     }
 }
 

actix-http/src/cookie/secure/key.rs

@@ -68,8 +68,8 @@ impl Key {
         encryption_key.copy_from_slice(&both_keys[SIGNED_KEY_LEN..]);
 
         Key {
-            signing_key: signing_key,
-            encryption_key: encryption_key,
+            signing_key,
+            encryption_key,
         }
     }
 

actix-http/src/cookie/secure/private.rs

@@ -37,7 +37,7 @@ impl<'a> PrivateJar<'a> {
         let mut key_array = [0u8; KEY_LEN];
         key_array.copy_from_slice(key.encryption());
         PrivateJar {
-            parent: parent,
+            parent,
             key: key_array,
         }
     }

actix-http/src/cookie/secure/signed.rs

@@ -31,7 +31,7 @@ impl<'a> SignedJar<'a> {
     #[doc(hidden)]
     pub fn new(parent: &'a mut CookieJar, key: &Key) -> SignedJar<'a> {
         SignedJar {
-            parent: parent,
+            parent,
             key: SigningKey::new(HMAC_DIGEST, key.signing()),
         }
     }