Bluetooth: __l2cap_wait_ack() add defensive timeout

Add a timeout to prevent the do while loop running in an
infinite loop. This ensures that the channel will be
instructed to close within 10 seconds so prevents
l2cap_sock_shutdown() getting stuck forever.

Returns -ENOLINK when the timeout is reached. The channel
will be subequently closed and not all data will be ACK'ed.

Signed-off-by: Dean Jenkins <Dean_Jenkins@mentor.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --cc include/net/bluetooth/l2cap.h
Simple merge

diff --cc net/bluetooth/l2cap_sock.c
Simple merge