revisions API: have release_revisions() release "date_mode"

Extend the the release_revisions() function so that it frees the
"date_mode" in the "struct ref_info".

This uses the date_mode_release() function added in 974c919 (date
API: add and use a date_mode_release(), 2022-02-16). As that commit
notes "t7004-tag.sh" tests for the leaks that are being fixed
here. That test now fails "only" 44 tests, instead of the 46 it failed
before this change.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

revision.c

@@ -2951,6 +2951,7 @@ void release_revisions(struct rev_info *revs)
 	release_revisions_cmdline(&revs->cmdline);
 	list_objects_filter_release(&revs->filter);
 	clear_pathspec(&revs->prune_data);
+	date_mode_release(&revs->date_mode);
 	release_revisions_mailmap(revs->mailmap);
 	free_grep_patterns(&revs->grep_filter);
 	diff_free(&revs->pruning);