[BLUETOOTH]: put_device before device_del fix

Because of workqueue delay, the put_device could be called before
device_del, so move it to del_conn.

Signed-off-by: Dave Young <hidave.darkstar@gmail.com> 
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index cef1e3e..cad5103 100644
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -320,6 +320,7 @@
 {
 	struct hci_conn *conn = container_of(work, struct hci_conn, work);
 	device_del(&conn->dev);
+	put_device(&conn->dev);
 }
 
 void hci_conn_del_sysfs(struct hci_conn *conn)