ipv6: fix sparse warning: Using plain integer as NULL pointer

Fix this sparse warning:
  net/ipv6/xfrm6_state.c:72:26: warning: Using plain integer as NULL pointer

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 file changed