firewire: implement broadcast_channel CSR for 1394a compliance

See IEEE 1394a clause 8.3.2.3.11.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c
index 5b4c0d9..96340ce 100644
--- a/drivers/firewire/fw-card.c
+++ b/drivers/firewire/fw-card.c
@@ -403,6 +403,7 @@
 	card->current_tlabel = 0;
 	card->tlabel_mask = 0;
 	card->color = 0;
+	card->broadcast_channel = BROADCAST_CHANNEL_INITIAL;
 
 	INIT_LIST_HEAD(&card->transaction_list);
 	spin_lock_init(&card->lock);