Merge "Add null check to avoid exception after L2CAP psm assigned"

 * and this function is called with the newly allocated PSM.

 */

void on_l2cap_psm_assigned(int id, int psm) {

    l2cap_socket *sock;

    /* Setup ETM settings:

     *  mtu will be set below */

    pthread_mutex_lock(&state_lock);

    sock = btsock_l2cap_find_by_id_l(id);

    l2cap_socket *sock = btsock_l2cap_find_by_id_l(id);

    if (sock) {

        sock->channel = psm;

    if(btSock_start_l2cap_server_l(sock) != BT_STATUS_SUCCESS) {

        if (btSock_start_l2cap_server_l(sock) != BT_STATUS_SUCCESS)

            btsock_l2cap_free_l(sock);

    } else {

        APPL_TRACE_ERROR("%s: Error: sock is null", __func__);

    }

    pthread_mutex_unlock(&state_lock);

}

static bt_status_t btSock_start_l2cap_server_l(l2cap_socket *sock) {