remove unreachable code

homeassistant/components/websocket_api/http.py

@@ -4,7 +4,6 @@
 import asyncio
 from collections import deque
 from collections.abc import Callable
-from concurrent import futures
 import datetime as dt
 import logging
 from typing import TYPE_CHECKING, Any, Final
@@ -140,11 +139,6 @@ async def _writer(self) -> None:
                 if debug_enabled:
                     debug("%s: Sending %s", self.description, coalesced_messages)
                 await send_str(coalesced_messages)
-        except futures.CancelledError as ex:
-            # Originally, this was just asyncio.CancelledError, but issue #9546 showed
-            # that futures.CancelledErrors can also occur in some situations.
-            debug("%s: Writer cancelled by future cancellation", self.description)
-            raise asyncio.CancelledError from ex
         except asyncio.CancelledError:
             debug("%s: Writer cancelled", self.description)
             raise