block: make function 'kill_bdev' static
kill_bdev does not have any external user, so make it static. Signed-off-by: Zheng Bin <zhengbin13@huawei.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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