configitems: register the 'badserver.closeafterrecvbytes' config

tests/badserverext.py

@@ -47,6 +47,9 b' configitem = registrar.configitem(config'
 configitem('badserver', 'closeafteraccept',
     default=False,
 )
+configitem('badserver', 'closeafterrecvbytes',
+    default=0,
+)
 
 # We can't adjust __class__ on a socket instance. So we define a proxy type.
 class socketproxy(object):
@@ -267,7 +270,7 b' def extsetup(ui):'
         def process_request(self, socket, address):
             # Wrap socket in a proxy if we need to count bytes.
             closeafterrecvbytes = self._ui.configint('badserver',
-                                                     'closeafterrecvbytes', 0)
+                                                     'closeafterrecvbytes')
             closeaftersendbytes = self._ui.configint('badserver',
                                                      'closeaftersendbytes', 0)