Minor cleanup.

diff --git a/tornado/websocket.py b/tornado/websocket.py
index a836c4bcfddb7c1da3ff8f238f37202c35f967aa..ce2af8600044ae828ef44acd8fd373389e432d10 100644 (file)
--- a/tornado/websocket.py
+++ b/tornado/websocket.py
@@ -390,7 +390,7 @@ class WebSocketProtocol8(WebSocketProtocol):
         raised
         """
         fields = ("Host", "Sec-Websocket-Key", "Sec-Websocket-Version")
-        if (not all(map(lambda f: self.request.headers.get(f), fields))):
+        if not all(map(lambda f: self.request.headers.get(f), fields)):
             raise ValueError("Missing/Invalid WebSocket headers")
 
     def _challenge_response(self):