Prevent corruption of the pckbc command queue. If multiple synchronous

commands are in flight and all corresponding threads are sleeping
waiting for a response, the first command to timeout will clear the
command queue. The remaining threads once awake will then try to remove
a dequeued command from the queue, leading to corruption. Instead,
remove commands from the queue before waking up the sleeping thread.
A quirk is still needed to handle the case where tsleep() returns
successfully during suspend.

ok mpi@ visa@

Reported-by: syzbot+fe74fc50c630bfa26302@syzkaller.appspotmail.com

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