Fix memory leaks in the date.[ch] API, in preparation for larger
changes to make the revision walking API stop leaking memory.

This is a trivial re-roll to v1, to fix an issue that "make hdr-check"
spotted. For v1 see:
https://lore.kernel.org/git/cover-0.5-00000000000-20220202T195651Z-avarab@gmail.com/ (local)

Ævar Arnfjörð Bjarmason (5):
  cache.h: remove always unused show_date_human() declaration
  date API: create a date.h, split from cache.h
  date API: provide and use a DATE_MODE_INIT
  date API: add basic API docs
  date API: add and use a date_mode_release()

 archive-zip.c         |  1 +
 builtin/am.c          |  1 +
 builtin/commit.c      |  1 +
 builtin/fast-import.c |  1 +
 builtin/show-branch.c |  1 +
 builtin/tag.c         |  1 +
 cache.h               | 50 -----------------------------
 config.c              |  1 +
 date.c                |  9 ++++--
 date.h                | 73 +++++++++++++++++++++++++++++++++++++++++++
 http-backend.c        |  1 +
 ident.c               |  1 +
 object-name.c         |  1 +
 pretty.h              | 10 ++++++
 ref-filter.c          |  3 +-
 reflog-walk.h         |  1 +
 refs.c                |  1 +
 strbuf.c              |  1 +
 t/helper/test-date.c  |  5 ++-
 t/t0006-date.sh       |  2 ++
 20 files changed, 111 insertions(+), 54 deletions(-)
 create mode 100644 date.h

Range-diff against v1:
1:  fb21bd7b2c5 = 1:  fb21bd7b2c5 cache.h: remove always unused show_date_human() declaration
2:  7de62956db4 ! 2:  96c904d0b9a date API: create a date.h, split from cache.h
    @@ pretty.h: int format_set_trailers_options(struct process_trailer_options *opts,
     +
      #endif /* PRETTY_H */
     
    + ## reflog-walk.h ##
    +@@
    + 
    + struct commit;
    + struct reflog_walk_info;
    ++struct date_mode;
    + 
    + void init_reflog_walk(struct reflog_walk_info **info);
    + int add_reflog_for_walk(struct reflog_walk_info *info,
    +
      ## refs.c ##
     @@
      #include "strvec.h"
3:  2d5210f9421 = 3:  9ef003a83bd date API: provide and use a DATE_MODE_INIT
4:  aab2ae9cc72 = 4:  3f70b1aa4c5 date API: add basic API docs
5:  b67e23549ed = 5:  60dbadacb16 date API: add and use a date_mode_release()
-- 
2.35.1.940.ge7a5b4b05f2