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It was reported [1] that Git started to fail with an out-of-memory error when initializing repositories with the reftable backend on NonStop platforms. A bisect led to 802c0646ac (reftable/merged: handle allocation failures in `merged_table_init_iter()`, 2024-10-02), which changed how we allocate memory when initializing a merged table. The root cause of this seems to be that NonStop returns a `NULL` pointer when doing a zero-sized allocation. This would've already happened before the above change, but we never noticed because we did not check the result. Now we do notice and thus return an out-of-memory error to the caller. Fix the issue by skipping the allocation altogether in case there are no readers. [1]: <00ad01db5017$aa9ce340$ffd6a9c0$@nexbridge.com> Reported-by: Randall S. Becker <rsbecker@nexbridge.com> Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>