net: axienet: Fix probe error cleanup

The driver did not always clean up all allocated resources when probe
failed. Fix the probe cleanup path to clean up everything that was
allocated.

Fixes: 57baf8cc

 ("net: axienet: Handle deferred probe on clock properly")
Signed-off-by: Robert Hancock <robert.hancock@calian.com>
Signed-off-by: David S. Miller <davem@davemloft.net>