Fix memory leaks pointed out by Coverity (and people).
* js/plug-leaks: (26 commits)
checkout: fix memory leak
submodule_uses_worktrees(): plug memory leak
show_worktree(): plug memory leak
name-rev: avoid leaking memory in the `deref` case
remote: plug memory leak in match_explicit()
add_reflog_for_walk: avoid memory leak
shallow: avoid memory leak
line-log: avoid memory leak
receive-pack: plug memory leak in update()
fast-export: avoid leaking memory in handle_tag()
mktree: plug memory leaks reported by Coverity
pack-redundant: plug memory leak
setup_discovered_git_dir(): plug memory leak
setup_bare_git_dir(): help static analysis
split_commit_in_progress(): simplify & fix memory leak
checkout: fix memory leak
cat-file: fix memory leak
mailinfo & mailsplit: check for EOF while parsing
status: close file descriptor after reading git-rebase-todo
difftool: address a couple of resource/memory leaks
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