net: lapb: Decrease the refcount of "struct lapb_cb" in lapb_device_e…

…vent

In lapb_device_event, lapb_devtostruct is called to get a reference to
an object of "struct lapb_cb". lapb_devtostruct increases the refcount
of the object and returns a pointer to it. However, we didn't decrease
the refcount after we finished using the pointer. This patch fixes this
problem.

Fixes: a4989fa ("net/lapb: support netdev events")
Cc: Martin Schiller <[email protected]>
Signed-off-by: Xie He <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

net/lapb/lapb_iface.c

@@ -489,6 +489,7 @@ static int lapb_device_event(struct notifier_block *this, unsigned long event,
 		break;
 	}
 
+	lapb_put(lapb);
 	return NOTIFY_DONE;
 }