[IPV6]: Clean up BACKTRACK().
The fn check is unnecessary as fn can never be NULL in BACKTRACK(). Signed-off-by: NVille Nuorvala <vnuorval@tcs.hut.fi> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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The fn check is unnecessary as fn can never be NULL in BACKTRACK(). Signed-off-by: NVille Nuorvala <vnuorval@tcs.hut.fi> Signed-off-by: NDavid S. Miller <davem@davemloft.net>