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This patch changes the prototpye of the ip6_mr_forward() method to return void
instead of int.

The ip6_mr_forward() method always returns 0; moreover, the return value of this
method is not checked anywhere.
Signed-off-by: Rami Rosen <ramirose@gmail.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>