[PATCH 0/6] more small leak fixes

[Jeff King <peff@peff.net>]

Based on the discussion over in [1], I wondered how close we were to
being able to run some test scripts with a leak-checker like LSan not
complaining. The answer is...not close.

I picked t5526 more or less at random (it was the first failure when I
did a parallel "make test") to see what it would take to get it passing.
After much effort...I have t5526.1, the setup test, running clean. :)

There were quite a few false positives, but it did actually uncover some
legitimate leaks. This series fixes those. I did it independently of the
leak-fix in [2], but it would be fine to just lump it all together as
one topic.

[1] https://lore.kernel.org/git/20200813155426.GA896769@coredump.intra.peff.net/
[2] https://lore.kernel.org/git/20200814111049.GA4101811@coredump.intra.peff.net/

The patches are:

  [1/6]: submodule--helper: use strbuf_release() to free strbufs
  [2/6]: checkout: fix leak of non-existent branch names
  [3/6]: config: fix leaks from git_config_get_string_const()
  [4/6]: config: drop git_config_get_string_const()
  [5/6]: config: fix leak in git_config_get_expiry_in_days()
  [6/6]: submodule--helper: fix leak of core.worktree value

 Documentation/MyFirstContribution.txt |  4 +--
 apply.c                               |  4 +--
 builtin/checkout.c                    |  4 ++-
 builtin/fetch.c                       |  2 +-
 builtin/submodule--helper.c           | 16 +++++------
 cache.h                               |  4 +--
 checkout.c                            |  3 +--
 config.c                              | 39 ++++++++++++++++++++++-----
 config.h                              | 12 ++++++---
 connect.c                             |  4 +--
 editor.c                              |  2 +-
 environment.c                         |  4 +--
 help.c                                |  2 +-
 protocol.c                            |  2 +-
 submodule.c                           |  4 +--
 t/helper/test-config.c                |  2 +-
 16 files changed, 69 insertions(+), 39 deletions(-)

-Peff