net: bridge: BROPT_FDB_LOCAL_VLAN_0: On port changeaddr, skip per-VLAN FDBs

net: bridge: BROPT_FDB_LOCAL_VLAN_0: On port changeaddr, skip per-VLAN FDBs

When BROPT_FDB_LOCAL_VLAN_0 is enabled, the local FDB entries for member
ports should not be created per-VLAN, but instead only on VLAN 0. When the
member port address changes, the local FDB entries need to be updated,
which is done in br_fdb_changeaddr().

Under the VLAN-0 mode, only one local FDB entry will ever be added for a
port's address, and that on VLAN 0. Thus bail out of the delete loop early.
For the same reason, also skip adding the per-VLAN entries.

Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/0cf9d41836d2a245b0ce07e1a16ee05ca506cbe9.1757004393.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>