ifb: fix packets checksum

Fixup the checksum for CHECKSUM_COMPLETE when pulling skbs on RX path.
Otherwise we get splats when tc mirred is used to redirect packets to ifb.

Before fix:

nic: hw csum failure

Signed-off-by: Jon Maxwell <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ifb.c

···
 		if (!skb->tc_from_ingress) {
 			dev_queue_xmit(skb);
 		} else {
-			skb_pull(skb, skb->mac_len);
+			skb_pull_rcsum(skb, skb->mac_len);
 			netif_receive_skb(skb);
 		}
 	}