ionic: clear linkcheck bit on alloc fail

Clear our link check requested flag on an allocation error.
We end up dropping this link check request, but that should
be fine as our watchdog will come back a few seconds later
and request it again.

Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>