gro: reset skb_iif on reuse

Like Herbert's change from a few days ago:

66c46d741e2e60f0e8b625b80edb0ab820c46d7a gro: Reset dev pointer on reuse

this may not be necessary at this point, but we should still clean up
the skb->skb_iif.  If not we may end up with an invalid valid for
skb->skb_iif when the skb is reused and the check is done in
__netif_receive_skb.

Signed-off-by: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/dev.c

@@ -3426,6 +3426,7 @@ static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
 	skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
 	skb->vlan_tci = 0;
 	skb->dev = napi->dev;
+	skb->skb_iif = 0;
 
 	napi->skb = skb;
 }