Avoid duplicate search for existing config entries in homekit_control…

…ler (home-assistant#107613)

homeassistant/components/homekit_controller/config_flow.py

@@ -20,7 +20,7 @@
 
 from homeassistant import config_entries
 from homeassistant.components import zeroconf
-from homeassistant.core import HomeAssistant, callback
+from homeassistant.core import callback
 from homeassistant.data_entry_flow import AbortFlow, FlowResult
 from homeassistant.helpers import device_registry as dr
 
@@ -79,17 +79,6 @@ def formatted_category(category: Categories) -> str:
     return str(category.name).replace("_", " ").title()
 
 
-@callback
-def find_existing_config_entry(
-    hass: HomeAssistant, upper_case_hkid: str
-) -> config_entries.ConfigEntry | None:
-    """Return a set of the configured hosts."""
-    for entry in hass.config_entries.async_entries(DOMAIN):
-        if entry.data.get("AccessoryPairingID") == upper_case_hkid:
-            return entry
-    return None
-
-
 def ensure_pin_format(pin: str, allow_insecure_setup_codes: Any = None) -> str:
     """Ensure a pin code is correctly formatted.
 
@@ -284,9 +273,7 @@ async def async_step_zeroconf(
         # Device isn't paired with us or anyone else.
         # But we have a 'complete' config entry for it - that is probably
         # invalid. Remove it automatically.
-        if not paired and (
-            existing := find_existing_config_entry(self.hass, upper_case_hkid)
-        ):
+        if not paired and existing_entry:
             if self.controller is None:
                 await self._async_setup_controller()
 
@@ -295,7 +282,7 @@ async def async_step_zeroconf(
             assert self.controller
 
             pairing = self.controller.load_pairing(
-                existing.data["AccessoryPairingID"], dict(existing.data)
+                existing_entry.data["AccessoryPairingID"], dict(existing_entry.data)
             )
 
             try:
@@ -310,7 +297,7 @@ async def async_step_zeroconf(
                     model,
                     hkid,
                 )
-                await self.hass.config_entries.async_remove(existing.entry_id)
+                await self.hass.config_entries.async_remove(existing_entry.entry_id)
             else:
                 _LOGGER.debug(
                     (