btrfs: factor out a btrfs_csum_ptr helper
Add a helper to find the csum for a byte offset into the csum buffer. Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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