MT#55283 set skb->dev

Since skb is a copy of the ingress skb, ->dev still points to the device
the packet was received on. For sending, set it to the outgoing device,
taken from the dst object.

Change-Id: Ia27b4318925dec4396e485a389d818dd46bcac78
(cherry picked from commit fa37be0625)

kernel-module/xt_RTPENGINE.c

@@ -4028,6 +4028,7 @@ static int send_proxy_packet4(struct sk_buff *skb, struct re_address *src, struc
 
 	if (skb_dst(skb)->error)
 		goto drop;
+	skb->dev = skb_dst(skb)->dev;
 
 	skb->ip_summed = CHECKSUM_NONE;
 
@@ -4138,6 +4139,7 @@ static int send_proxy_packet6(struct sk_buff *skb, struct re_address *src, struc
 	}
 	skb_dst_drop(skb);
 	skb_dst_set(skb, dst_entry);
+	skb->dev = skb_dst(skb)->dev;
 
 	skb->ip_summed = CHECKSUM_NONE;