Bluetooth: add debug output to l2cap_ack_timeout()

Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 944c189..cd7bb3d 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -1985,6 +1985,8 @@
 	struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
 							ack_timer.work);
 
+	BT_DBG("chan %p", chan);
+
 	lock_sock(chan->sk);
 	l2cap_send_ack(chan);
 	release_sock(chan->sk);