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>
diff --git a/net/tipc/ib_media.c b/net/tipc/ib_media.c
index 7aa9ff8..b9ad043 100644
--- a/net/tipc/ib_media.c
+++ b/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);