Clear packet before creating new one

Else we send the last packet as payload for the
new one.
Better would be to use ptags for reuse and
modification of packets.

boreas/arp.c

@@ -425,6 +425,7 @@ send_arp_v4 (const char *dst_str)
   g_debug ("ARP PING %s", dst_str);
 
   pingip_send ();
+  libnet_clear_packet (libnet);
 
   g_free (target);
 }