Merge pull request #2867 from DamirAinullin/master

Fix of simple mistakes and typos

src/Nancy/Cryptography/AesEncryptionProvider.cs

@@ -72,7 +72,7 @@ public string Decrypt(string data)
                 {
                     return String.Empty;
                 }
-                throw ex;
+                throw;
             }
         }
     }

src/Nancy/Cryptography/DefaultHmacProvider.cs

@@ -57,9 +57,10 @@ public byte[] GenerateHmac(string data)
         /// <returns>Hmac bytes</returns>
         public byte[] GenerateHmac(byte[] data)
         {
-            var hmacGenerator = new HMACSHA256(this.key);
-
-            return hmacGenerator.ComputeHash(data);
+            using (var hmacGenerator = new HMACSHA256(this.key))
+            {
+                return hmacGenerator.ComputeHash(data);
+            }
         }
     }
-}
+}

src/Nancy/Owin/NancyMiddleware.cs

@@ -73,8 +73,7 @@ public static MidFunc UseNancy(NancyOptions options = null)
                         X509Certificate2 certificate = null;
                         if (options.EnableClientCertificates)
                         {
-                            var clientCertificate = new X509Certificate2(Get<X509Certificate>(environment, "ssl.ClientCertificate").Export(X509ContentType.Cert));
-                            certificate = clientCertificate ?? null;
+                            certificate = new X509Certificate2(Get<X509Certificate>(environment, "ssl.ClientCertificate").Export(X509ContentType.Cert));
                         }
 
                         var serverClientIp = Get<string>(environment, "server.RemoteIpAddress");