firewire: net: Make use of get_unaligned_be48(), put_unaligned_be48()

Since we have a proper endianness converters for BE 48-bit data use
them.

Signed-off-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/firewire/net.c

···
 };
 
 /*
- * Get fifo address embedded in hwaddr
- */
-static __u64 fwnet_hwaddr_fifo(union fwnet_hwaddr *ha)
-{
-	return (u64)get_unaligned_be16(&ha->uc.fifo_hi) << 32
-	       | get_unaligned_be32(&ha->uc.fifo_lo);
-}
-
-/*
  * saddr == NULL means use device source address.
  * daddr == NULL means leave destination address (eg unresolved arp).
  */
···
 		max_payload        = peer->max_payload;
 		datagram_label_ptr = &peer->datagram_label;
 
-		ptask->fifo_addr   = fwnet_hwaddr_fifo(ha);
+		ptask->fifo_addr   = get_unaligned_be48(ha->uc.fifo);
 		ptask->generation  = generation;
 		ptask->dest_node   = dest_node;
 		ptask->speed       = peer->speed;
···
 	ha.uc.uniq_id = cpu_to_be64(card->guid);
 	ha.uc.max_rec = dev->card->max_receive;
 	ha.uc.sspd = dev->card->link_speed;
-	ha.uc.fifo_hi = cpu_to_be16(dev->local_fifo >> 32);
-	ha.uc.fifo_lo = cpu_to_be32(dev->local_fifo & 0xffffffff);
+	put_unaligned_be48(dev->local_fifo, ha.uc.fifo);
 	dev_addr_set(net, ha.u);
 
 	memset(net->broadcast, -1, net->addr_len);

include/net/firewire.h

···
 		__be64 uniq_id;		/* EUI-64			*/
 		u8 max_rec;		/* max packet size		*/
 		u8 sspd;		/* max speed			*/
-		__be16 fifo_hi;		/* hi 16bits of FIFO addr	*/
-		__be32 fifo_lo;		/* lo 32bits of FIFO addr	*/
+		u8 fifo[6];		/* FIFO addr			*/
 	} __packed uc;
 };