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Depending on compiler version and optimization level, we might get a complaint that lazy_scan_heap's "freespace" is used uninitialized. Compilers not aware that ereport(ERROR) doesn't return complained about bbsink_lz4_new(). Assigning "-1" to a uint64 value has unportable results; fortunately, the value of xlogreadsegno is unimportant when xlogreadfd is -1. (It looks to me like there is no need for xlogreadsegno to be static in the first place, but I didn't venture to change that.)