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

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

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

Bail out early when in VLAN-0 mode, so that the per-VLAN FDB entries are
not created. The per-VLAN walk is only done afterwards.

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/0bd432cf91921ef7c4ed0e129de1d1cd358c716b.1757004393.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>