listener: fix device registration logic

The "already_known" var actually doesn't track if the device was
already registered or not.

That causes race issues at Solaar, causing it to sometimes not
detect a device.

Change the logic to always call register_new_device if the
corresponding events happen, and updating already_known
to reflect it.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

lib/solaar/listener.py

@@ -183,7 +183,9 @@ class ReceiverListener(_listener.EventsListener):
 		# a device notification
 		assert n.devnumber > 0 and n.devnumber <= self.receiver.max_devices
 		already_known = n.devnumber in self.receiver
-		if not already_known and n.sub_id == 0x41:
+
+		if n.sub_id == 0x41:
+			already_known = False
 			dev = self.receiver.register_new_device(n.devnumber, n)
 		else:
 			dev = self.receiver[n.devnumber]