When I added the multicast flood control flag, I also added an attribute
for it for sysfs similar to other flags, but I forgot to add it to
brport_attrs.
Fixes: 6e61a26957f4 ("net: bridge: add per-port multicast flood flag") Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>