[Modify] Polish it

websocket-sharp/WebSocket.cs

@@ -1770,12 +1770,15 @@ namespace WebSocketSharp
     {
       try {
         _stream.Write (bytes, 0, bytes.Length);
-        return true;
       }
       catch (Exception ex) {
-        _logger.Error (ex.ToString ());
+        _logger.Error (ex.Message);
+        _logger.Debug (ex.ToString ());
+
         return false;
       }
+
+      return true;
     }
 
     // As client