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committer David S. Miller <davem@davemloft.net> 1331071127 -0500

IPv6: Fix not join all-router mcast group when forwarding set.

When forwarding was set and a new net device is register,
we need add this device to the all-router mcast group.

Signed-off-by: Li Wei <lw@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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