[Modify] Polish it

websocket-sharp/Net/EndPointListener.cs

@@ -94,27 +94,43 @@ namespace WebSocketSharp.Net
       bool reuseAddress
     )
     {
+      _endpoint = endpoint;
+
       if (secure) {
-        var cert =
+        var cert = getCertificate (
-          getCertificate (endpoint.Port, certificateFolderPath, sslConfig.ServerCertificate);
+                     endpoint.Port,
+                     certificateFolderPath,
+                     sslConfig.ServerCertificate
+                   );
 
-        if (cert == null)
+        if (cert == null) {
-          throw new ArgumentException ("No server certificate could be found.");
+          var msg = "No server certificate could be found.";
+
+          throw new ArgumentException (msg);
+        }
 
         _secure = true;
         _sslConfig = new ServerSslConfiguration (sslConfig);
         _sslConfig.ServerCertificate = cert;
       }
 
-      _endpoint = endpoint;
       _prefixes = new Dictionary<HttpListenerPrefix, HttpListener> ();
       _unregistered = new Dictionary<HttpConnection, HttpConnection> ();
       _unregisteredSync = ((ICollection) _unregistered).SyncRoot;
-      _socket =
-        new Socket (endpoint.Address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
 
-      if (reuseAddress)
+      _socket = new Socket (
-        _socket.SetSocketOption (SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
+                  endpoint.Address.AddressFamily,
+                  SocketType.Stream,
+                  ProtocolType.Tcp
+                );
+
+      if (reuseAddress) {
+        _socket.SetSocketOption (
+          SocketOptionLevel.Socket,
+          SocketOptionName.ReuseAddress,
+          true
+        );
+      }
 
       _socket.Bind (endpoint);
       _socket.Listen (500);