Check return value only if the call succeed.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1701 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/connection.py

@@ -259,15 +259,14 @@ class Connection(BaseConnection):
     def analyse(self):
         """Analyse received data."""
         while True:
-            packet = None
             try:
                 packet = Packets.parse(self.read_buf)
+                if packet is None:
+                    break
             except PacketMalformedError, msg:
                 self.handler._packetMalformed(self, packet, msg)
                 return
 
-            if packet is None:
-                break
 
             # Remove idle events, if appropriate packets were received.
             for msg_id in (None, packet.getId()):