Inconsistent producer start/stop

[valq7711]

As there is self._closed = False in __init__, then it requires to call await producer.stop() even if it is not started.

producer = aiokafka.AIOKafkaProducer(bootstrap_servers="localhost:9092")
del producer  # Unclosed AIOKafkaProducer

aiokafka/aiokafka/producer/producer.py

Lines 286 to 294 in 00349a8

	self._closed = False
	# Warn if producer was not closed properly
	# We don't attempt to close the Consumer, as __del__ is synchronous
	def __del__(self, _warnings=warnings):
	if self._closed is False:
	_warnings.warn(f"Unclosed AIOKafkaProducer {self!r}",
	ResourceWarning,
	source=self)