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In show_one_reflog_ent(), we're fed a writable strbuf buffer, which we parse into the various reflog components. We write a NUL over email_end to tie off one of the fields, and thus email_end must be non-const. But with a C23 implementation of libc, strchr() will now complain when assigning the result to a non-const pointer from a const one. So we can fix this by making the source pointer non-const. But there's a catch. We derive that source pointer by parsing the line with parse_oid_hex_algop(), which requires a const pointer for its out-parameter. We can work around that by teaching it to use our CONST_OUTPARAM() trick, just like skip_prefix(). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>