During a hotplug attempt, failsafe will try to bring a subdevice that
just appeared to its internal state. On error, the subdevice is marked
for removal and will be cleaned up.
However failsafe_dev_remove() only remove active devices. Devices that
failed during probe will be stuck in DEV_PARSED state repeatedly.
Consider all devices when doing a removal round, but limit burst control
and stats saving to active devices.