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Both `struct block_writer` and `struct reftable_writer` have a `buf` member that is being reused to optimize the number of allocations. Rename the variable to `scratch` to clarify its intend and provide a comment explaining why it exists. Suggested-by: Christian Couder <christian.couder@gmail.com> Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>