Backport of "sparsefile: ensure error is set when read_buffer() returns 0" into 1.24
Backport of !8321 (merged) "sparsefile: ensure error is set when read_buffer() returns 0".
Commits:
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60f4cd77
sparsefile: fix typo in doc -
5b4eb339
sparsefile: ensure error is set when read_buffer() returns 0