[NET]: Correct two mistaken skb_reset_mac_header() conversions.

This operation helper abstracts:

	skb->mac_header = skb->data;

but it was done in two more places which were actually:

	skb->mac_header = skb->network_header;

and those are corrected here.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ax25/ax25_in.c b/net/ax25/ax25_in.c
index 3b7d172..d1be080 100644
--- a/net/ax25/ax25_in.c
+++ b/net/ax25/ax25_in.c
@@ -124,7 +124,7 @@
 		}
 
 		skb_pull(skb, 1);	/* Remove PID */
-		skb_reset_mac_header(skb);
+		skb->mac_header = skb->network_header;
 		skb_reset_network_header(skb);
 		skb->dev      = ax25->ax25_dev->dev;
 		skb->pkt_type = PACKET_HOST;