tipc: constify dev_addr passing

In preparation for netdev->dev_addr being constant
make all relevant arguments in tipc constant.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/tipc/bearer.c

@@ -462,7 +462,7 @@ int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
 	b->bcast_addr.media_id = b->media->type_id;
 	b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
 	b->mtu = dev->mtu;
-	b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
+	b->media->raw2addr(b, &b->addr, (const char *)dev->dev_addr);
 	rcu_assign_pointer(dev->tipc_ptr, b);
 	return 0;
 }
@@ -703,7 +703,7 @@ static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 		break;
 	case NETDEV_CHANGEADDR:
 		b->media->raw2addr(b, &b->addr,
-				   (char *)dev->dev_addr);
+				   (const char *)dev->dev_addr);
 		tipc_reset_bearer(net, b);
 		break;
 	case NETDEV_UNREGISTER:

net/tipc/bearer.h

@@ -117,7 +117,7 @@ struct tipc_media {
 			char *msg);
 	int (*raw2addr)(struct tipc_bearer *b,
 			struct tipc_media_addr *addr,
-			char *raw);
+			const char *raw);
 	u32 priority;
 	u32 tolerance;
 	u32 min_win;

net/tipc/eth_media.c

@@ -60,7 +60,7 @@ static int tipc_eth_addr2msg(char *msg, struct tipc_media_addr *addr)
 /* Convert raw mac address format to media addr format */
 static int tipc_eth_raw2addr(struct tipc_bearer *b,
 			     struct tipc_media_addr *addr,
-			     char *msg)
+			     const char *msg)
 {
 	memset(addr, 0, sizeof(*addr));
 	ether_addr_copy(addr->value, msg);

net/tipc/ib_media.c

@@ -67,7 +67,7 @@ static int tipc_ib_addr2msg(char *msg, struct tipc_media_addr *addr)
 /* Convert raw InfiniBand address format to media addr format */
 static int tipc_ib_raw2addr(struct tipc_bearer *b,
 			    struct tipc_media_addr *addr,
-			    char *msg)
+			    const char *msg)
 {
 	memset(addr, 0, sizeof(*addr));
 	memcpy(addr->value, msg, INFINIBAND_ALEN);