ionic: init reconfig err to 0

Initialize err to 0 instead of ENOMEM, and specifically set
err to ENOMEM in the devm_kcalloc() failure cases.

Also, add an error message to the end of reconfig.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>