Revert "net: bonding: fix error return code of bond_neigh_init()"

stable inclusion
from stable-5.10.27
commit 36478a9ec5afd4efd031527d0371bf8f61e5aa91
bugzilla: 51493

--------------------------------

commit 080bfa1e upstream.

This reverts commit 2055a99d.

This change rejects legitimate configurations.

A slave doesn't need to exist nor implement ndo_slave_setup.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by:   Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>