cnetlink: remove redundant bridge check in neigh_ll_{created,deleted}
cnetlink: remove redundant bridge check in neigh_ll_{created,deleted}

::check_ll_neigh already checks bridge to be set, so at this point
bridge cannot be a nullptr.

Signed-off-by: Jonas Gorski <9712c064bde5a52658fc87d6454b4956f9bf286b@bisdn.de>

bisdn/basebox,bisdn/basebox,bisdn/basebox,bisdn/basebox