ipv6: remove a useless NULL check
In dev_forward_change(), it is useless to check if idev->dev is NULL, it is always non-NULL here. Reported-by: NFengguang Wu <fengguang.wu@intel.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by: NCong Wang <amwang@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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