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For debug, it is useful for bus providers to be able to retrieve the 'struct device' associated with an nd_region instance that it registered. We already have to_nd_region() to perform the reverse cast operation, in fact its duplicate declaration can be removed from the private drivers/nvdimm/nd.h header. Reviewed-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>