Fix pyflakes warnings

synapse/config/server.py

@@ -74,7 +74,7 @@ class ServerConfig(Config):
             return syutil.crypto.signing_key.read_signing_keys(
                 signing_keys.splitlines(True)
             )
-        except Exception as e:
+        except Exception:
             raise ConfigError(
                 "Error reading signing_key."
                 " Try running again with --generate-config"

synapse/crypto/keyclient.py

@@ -17,7 +17,6 @@
 from twisted.web.http import HTTPClient
 from twisted.internet.protocol import Factory
 from twisted.internet import defer, reactor
-from twisted.internet.endpoints import connectProtocol
 from synapse.http.endpoint import matrix_endpoint
 import json
 import logging

synapse/rest/room.py

@@ -344,7 +344,7 @@ class RoomInitialSyncRestServlet(RestServlet):
 
     @defer.inlineCallbacks
     def on_GET(self, request, room_id):
-        user = yield self.auth.get_user_by_req(request)
+        yield self.auth.get_user_by_req(request)
         # TODO: Get all the initial sync data for this room and return in the
         # same format as initial sync, that is:
         # {

synapse/storage/keys.py

@@ -104,7 +104,6 @@ class KeyStore(SQLBaseStore):
             ts_now_ms (int): The time now in milliseconds
             verification_key (VerifyKey): The NACL verify key.
         """
-        verify_key_bytes = verify_key.encode()
         return self._simple_insert(
             table="server_signature_keys",
             values={