• grab ng_btsocket_l2cap_sockets_mtx lock in ng_btsocket_l2cap_process_l2ca_enc_change() before calling ng_btsocket_l2cap_pcb_by_cid();

• handle possible NULL value returned from ng_btsocket_l2cap_pcb_by_cid();

Submitted by: Hans Petter Selasky; hps at selasky dot org
MFC after: 1 week