net: bridge: fixing typo in log

Signed-off-by: William Dauchy <william@gandi.net>
Signed-off-by: Ahmed Amamou <ahmed@gandi.net>
net: bridge: rbridge: Handle L2 switch flooding

Add check on source and destination outer mac adresses in order to
handle cases where L2 switches flood packets.
In fact, in such scenario if destination mac addresses is not checked
each node will try to send packets to final destination resulting an
unnecessary packet duplication.

Signed-off-by: William Dauchy <william@gandi.net>
Signed-off-by: Ahmed Amamou <ahmed@gandi.net>