diff.[ch]: have diff_free() free options->parseopts
The "struct option" added in 4a288478394 (diff.c: prepare to use parse_options() for parsing, 2019-01-27) would be free'd in the case of diff_setup_done() being called. But not all codepaths that allocate it reach that, e.g. "t6427-diff3-conflict-markers.sh" will now free memory that it didn't free before. By using FREE_AND_NULL() here (which diff_setup_done() also does) we ensure that we free the memory, and that we won't have double-free's. Before this running: ./t6427-diff3-conflict-markers.sh -vixd --run=7 Would report: SUMMARY: LeakSanitizer: 7823 byte(s) leaked in 6 allocation(s). But now we'll report: SUMMARY: LeakSanitizer: 703 byte(s) leaked in 5 allocation(s). I.e. the largest leak in that particular test has now been addressed. Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Reviewed-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>