ipv6: Avoid going through ->sk_net to access the netns

There is no need to go through sk->sk_net to access the net namespace
and its sysctl variables because we allocate the sock and initialize
sk_net just a few lines earlier in the same routine.

Signed-off-by: Jakub Sitnicki <jkbs@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/af_inet6.c

@@ -210,7 +210,7 @@ lookup_protocol:
 	np->mcast_hops	= IPV6_DEFAULT_MCASTHOPS;
 	np->mc_loop	= 1;
 	np->pmtudisc	= IPV6_PMTUDISC_WANT;
-	np->autoflowlabel = ip6_default_np_autolabel(sock_net(sk));
+	np->autoflowlabel = ip6_default_np_autolabel(net);
 	sk->sk_ipv6only	= net->ipv6.sysctl.bindv6only;
 
 	/* Init the ipv4 part of the socket since we can have sockets