[Modify] Polish it

websocket-sharp/Net/HttpConnection.cs

@@ -371,14 +371,16 @@ namespace WebSocketSharp.Net
       if (_currentLine == null)
         _currentLine = new StringBuilder (64);
 
-      var nread = 0;
-
       try {
-        string line;
+        while (true) {
+          int nread;
+          var line = readLineFrom (data, _position, length, out nread);
 
-        while ((line = readLineFrom (data, _position, length, out nread)) != null) {
           _position += nread;
 
+          if (line == null)
+            break;
+
           if (line.Length == 0) {
             if (_inputState == InputState.RequestLine)
               continue;
@@ -409,8 +411,6 @@ namespace WebSocketSharp.Net
         return true;
       }
 
-      _position += nread;
-
       if (_position >= 32768) {
         _context.ErrorMessage = "Headers too long";