batman-adv: bcast: avoid skb-copy for (re)queued broadcasts

Broadcast packets send via batadv_send_outstanding_bcast_packet() were
originally copied in batadv_forw_bcast_packet_to_list() before being
queued. And after that only the ethernet header will be pushed through
batadv_send_broadcast_skb()->batadv_send_skb_packet() which works safely
on skb clones as it uses batadv_skb_head_push()->skb_cow_head().
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>

net/batman-adv/send.c

@@ -1072,7 +1072,7 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
 	}
 
 	/* send a copy of the saved skb */
-	skb1 = skb_copy(forw_packet->skb, GFP_ATOMIC);
+	skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
 	if (!skb1)
 		goto out;