Close HTTP client correctly

Thanks @eavanvalkenburg!

custom_components/tahoma/__init__.py

@@ -7,7 +7,7 @@
 from tahoma_api.exceptions import BadCredentialsException, TooManyRequestsException
 
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
+from homeassistant.const import CONF_PASSWORD, CONF_USERNAME, EVENT_HOMEASSISTANT_STOP
 from homeassistant.core import HomeAssistant
 
 from .const import DOMAIN, TAHOMA_TYPES
@@ -88,6 +88,12 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry):
                 hass.config_entries.async_forward_entry_setup(entry, platform)
             )
 
+    async def async_close_client(self, *_):
+        """Close HTTP client."""
+        await client.close()
+
+    hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STOP, async_close_client)
+
     return True
 
 
@@ -108,11 +114,3 @@ async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry):
     await client.close()
 
     return unload_ok
-
-
-async def async_shutdown(self, _):
-    """Remove all future updates, cancel tasks and close the client."""
-    self._shutdown = True
-
-    for entry in self.hass.data[DOMAIN]:
-        await entry.get("controller").close()