[NETFILTER]: fix NAT ICMP reply translation of inner packet.

net/ipv4/netfilter/ip_nat_core.c

@@ -913,7 +913,7 @@ icmp_reply_translation(struct sk_buff *skb,
 		   packet, except it was never src/dst reversed, so
 		   where we would normally apply a dst manip, we apply
 		   a src, and vice versa. */
-		if (info->manips[i].hooknum == opposite_hook[hooknum]) {
+		if (info->manips[i].hooknum == hooknum) {
 			DEBUGP("icmp_reply: inner %s -> %u.%u.%u.%u %u\n",
 			       info->manips[i].maniptype == IP_NAT_MANIP_SRC
 			       ? "DST" : "SRC",
@@ -926,7 +926,7 @@ icmp_reply_translation(struct sk_buff *skb,
 				  &skb->nfcache);
 			/* Outer packet needs to have IP header NATed like
 	                   it's a reply. */
-		} else if (info->manips[i].hooknum == hooknum) {
+
 			/* Use mapping to map outer packet: 0 give no
                            per-proto mapping */
 			DEBUGP("icmp_reply: outer %s -> %u.%u.%u.%u\n",