Bluetooth: trivial: Use defined PSMLEN instead of magic

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

net/bluetooth/l2cap_core.c

@@ -5235,7 +5235,7 @@ static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
 
 	case L2CAP_CID_CONN_LESS:
 		psm = get_unaligned((__le16 *) skb->data);
-		skb_pull(skb, 2);
+		skb_pull(skb, L2CAP_PSMLEN_SIZE);
 		l2cap_conless_channel(conn, psm, skb);
 		break;