Bluetooth: Fix memory leak with L2CAP channels

A new l2cap_chan_free() is added to free the channels.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 3de90a9..0a01341 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -469,6 +469,7 @@
 void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err);
 struct l2cap_chan *l2cap_chan_alloc(struct sock *sk);
 void l2cap_chan_del(struct l2cap_chan *chan, int err);
+void l2cap_chan_free(struct l2cap_chan *chan);
 int l2cap_chan_connect(struct l2cap_chan *chan);
 
 #endif /* __L2CAP_H */