commit-reach: fix cast in compare_commits_by_gen()
The elements of the array to be sorted are commit pointers, so the comparison function gets handed references to these pointers, not pointers to commit objects. Cast to the right type and dereference once to correctly get the commit reference. Found using Clang's ASan and t5500. Signed-off-by: NRene Scharfe <l.s.r@web.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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