Bluetooth: Fix lockdep warning in L2CAP

Fix a regression from the L2CAP "rewrite" patches.
Purge the tx_q already happens on l2cap_chan_del() so we don't need it at
l2cap_disconnect_req().

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index bc84ed1..d47de2b 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -477,8 +477,6 @@
 
 	sk = chan->sk;
 
-	skb_queue_purge(&chan->tx_q);
-
 	if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
 		del_timer(&chan->retrans_timer);
 		del_timer(&chan->monitor_timer);