net: IPv6 changes

IPv6: Reset sk_tx_queue_mapping when dst_cache is reset. Use existing
macro to do the work.
Signed-off-by: NKrishna Kumar <krkumar2@in.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/inet6_connection_sock.c

@@ -168,8 +168,7 @@ struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
 	if (dst) {
 		struct rt6_info *rt = (struct rt6_info *)dst;
 		if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) {
-			sk->sk_dst_cache = NULL;
-			dst_release(dst);
+			__sk_dst_reset(sk);
 			dst = NULL;
 		}
 	}