Bluetooth: Fix not setting a pending security level

For slave initiated security, we should set a default security level,
for now BT_SECURITY_MEDIUM.
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

net/bluetooth/smp.c

@@ -531,6 +531,8 @@ static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
 
 	BT_DBG("conn %p", conn);
 
+	hcon->pending_sec_level = BT_SECURITY_MEDIUM;
+
 	if (smp_ltk_encrypt(conn))
 		return 0;