Fix lingering timer in iaqualink (#92856)

homeassistant/components/iaqualink/__init__.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 
 import asyncio
 from collections.abc import Awaitable, Callable, Coroutine
+from datetime import datetime
 from functools import wraps
 import logging
 from typing import Any, Concatenate, ParamSpec, TypeVar
@@ -139,7 +140,7 @@ async def async_setup_entry(  # noqa: C901
 
     await hass.config_entries.async_forward_entry_setups(entry, platforms)
 
-    async def _async_systems_update(now):
+    async def _async_systems_update(_: datetime) -> None:
         """Refresh internal state for all systems."""
         for system in systems:
             prev = system.online
@@ -161,7 +162,9 @@ async def async_setup_entry(  # noqa: C901
 
             async_dispatcher_send(hass, DOMAIN)
 
-    async_track_time_interval(hass, _async_systems_update, UPDATE_INTERVAL)
+    entry.async_on_unload(
+        async_track_time_interval(hass, _async_systems_update, UPDATE_INTERVAL)
+    )
 
     return True