block: remove unused copy_io_context()
Reported-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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Reported-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>