[Modify] Polish it

websocket-sharp/Ext.cs

@@ -650,28 +650,33 @@ namespace WebSocketSharp
     }
 
     internal static void ReadBytesAsync (
-      this Stream stream, int length, Action<byte[]> completed, Action<Exception> error)
+      this Stream stream, int length, Action<byte[]> completed, Action<Exception> error
+    )
     {
       var buff = new byte[length];
       var offset = 0;
       var retry = 0;
 
       AsyncCallback callback = null;
-      callback = ar => {
+      callback =
+        ar => {
           try {
             var nread = stream.EndRead (ar);
             if (nread == 0 && retry < _retry) {
               retry++;
+              stream.BeginRead (buff, offset, length, callback, null);
+
+              return;
             }
-          else if (nread == 0 || nread == length) {
+
+            if (nread == 0 || nread == length) {
               if (completed != null)
                 completed (buff.SubArray (0, offset + nread));
 
               return;
             }
-          else {
+
             retry = 0;
-          }
 
             offset += nread;
             length -= nread;