bind(psm=BNEP)           = 0 (ok)
listen()                 = 0 (ok, channel now on l2cap_listen_list)
RE-bind(psm=HID_CNTL) on the LISTENING socket = 0 (ok)   <-- DF-5750: state check missing
listen() again           = -1 (Invalid argument)  [unexpected]
bind(same psm on 2nd socket) = 0 (ok (no duplicate-PSM rejection))
listen() on 2nd socket   = 0 (ok)