[NETFILTER]: Fix -Wunder error in ip_conntrack_core.c

Signed-off-by: Nick Sillik <n.sillik@temple.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/netfilter/ip_conntrack_core.c

@@ -510,7 +510,7 @@ init_conntrack(const struct ip_conntrack_tuple *tuple,
 		/* Welcome, Mr. Bond.  We've been expecting you... */
 		__set_bit(IPS_EXPECTED_BIT, &conntrack->status);
 		conntrack->master = exp->master;
-#if CONFIG_IP_NF_CONNTRACK_MARK
+#ifdef CONFIG_IP_NF_CONNTRACK_MARK
 		conntrack->mark = exp->master->mark;
 #endif
 		nf_conntrack_get(&conntrack->master->ct_general);