dm: do not reuse dm_blk_ioctl block_device input as local variable
(Ab)using the @bdev passed to dm_blk_ioctl() opens the potential for targets' .prepare_ioctl to fail if they go on to check the bdev for !NULL. Fixes: e56f81e0 ("dm: refactor ioctl handling") Reported-by: NJunichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: NMike Snitzer <snitzer@redhat.com>
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