Merge branch 'js/coverity-unchecked-returns-fix' into jch

A handful of code paths have been corrected to check return values from functions like curl_easy_duphandle(), deflateInit(), lseek(), dup(), and strbuf_getline_lf(), resolving several Coverity warnings about unchecked returns. * js/coverity-unchecked-returns-fix: bisect: handle dup() failure when redirecting stdout bisect: check get_terms return at all call sites bisect: check strbuf_getline_lf return when reading terms transport-helper: warn when export-marks file cannot be finalized transport-helper: check dup() return in get_exporter compat/pread: check initial lseek for errors last-modified: handle repo_parse_commit() failures reftable tests: check reftable_table_init_ref_iterator() return reftable/block: check deflateInit() return value config: propagate launch_editor() failure in show_editor() http: die on curl_easy_duphandle failure in get_active_slot