6lowpan: remove skb->dev assignment

This patch removes the assignment of skb->dev. We don't need it here because
we use the netdev_alloc_skb_ip_align function which already sets the
skb->dev.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reviewed-by: Werner Almesberger <werner@almesberger.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ieee802154/6lowpan.c

@@ -785,7 +785,6 @@ lowpan_alloc_new_frame(struct sk_buff *skb, u16 len, u16 tag)
 		goto skb_err;
 
 	frame->skb->priority = skb->priority;
-	frame->skb->dev = skb->dev;
 
 	/* reserve headroom for uncompressed ipv6 header */
 	skb_reserve(frame->skb, sizeof(struct ipv6hdr));