Update pytest_httpserver/httpserver.py

Co-authored-by: Hayao <hayao_s@tokyo-gas.co.jp>

Author: csernazs

pytest_httpserver/httpserver.py

@@ -982,10 +982,7 @@ def __init__(
         self._readiness_check_pending = False
 
     def start(self) -> None:
-        if self.startup_timeout is None:
-            self._readiness_check_pending = False
-        else:
-            self._readiness_check_pending = True
+        self._readiness_check_pending = self.startup_timeout is not None
 
         super().start()
         self.wait_for_server_ready()