Merge branch 'ps/leakfixes-part-9'

Merge branch 'ps/leakfixes-part-9'

More leakfixes.

* ps/leakfixes-part-9: (22 commits)
  list-objects-filter-options: work around reported leak on error
  builtin/merge: release output buffer after performing merge
  dir: fix leak when parsing "status.showUntrackedFiles"
  t/helper: fix leaking buffer in "dump-untracked-cache"
  t/helper: stop re-initialization of `the_repository`
  sparse-index: correctly free EWAH contents
  dir: release untracked cache data
  combine-diff: fix leaking lost lines
  builtin/tag: fix leaking key ID on failure to sign
  transport-helper: fix leaking import/export marks
  builtin/commit: fix leaking cleanup config
  trailer: fix leaking strbufs when formatting trailers
  trailer: fix leaking trailer values
  builtin/commit: fix leaking change data contents
  upload-pack: fix leaking URI protocols
  pretty: clear signature check
  diff-lib: fix leaking diffopts in `do_diff_cache()`
  revision: fix leaking bloom filters
  builtin/grep: fix leak with `--max-count=0`
  grep: fix leak in `grep_splice_or()`
  ...