zram: use memcpy_to_bvec in zram_bvec_read
Use the proper helper instead of open coding the copy. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Link: https://lore.kernel.org/r/20220303111905.321089-4-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>
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