funeth: remove pointless check of devlink pointer in create/destroy_netdev() flows

Once devlink port is successfully registered, the devlink pointer is not
NULL. Therefore, the check is going to be always true and therefore
pointless. Remove it.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Dimitris Michailidis <dmichail@fungible.com>
Link: https://lore.kernel.org/r/20220826110411.1409446-1-jiri@resnulli.us


Signed-off-by: Jakub Kicinski <kuba@kernel.org>