Bluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_conn_del()

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                        "net/bluetooth/af_bluetooth.c",
                        "net/bluetooth/iso.c",
                        "net/bluetooth/l2cap_sock.c",
                        "net/bluetooth/rfcomm/sock.c",
                        "net/bluetooth/sco.c"
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                        "net/bluetooth/af_bluetooth.c",
                        "net/bluetooth/iso.c",
                        "net/bluetooth/l2cap_sock.c",
                        "net/bluetooth/rfcomm/sock.c",
                        "net/bluetooth/sco.c"
                    ],
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