dm rq: add a missing break to map_request
We don't want to bug when receiving a DM_MAPIO_KILL value.. Fixes: 412445ac ("dm: introduce a new DM_MAPIO_KILL return value") Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NMike Snitzer <snitzer@redhat.com>
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