Merge branch 'sb/plug-misc-leaks'

Misc leak plugging.

* sb/plug-misc-leaks:
sequencer.c: plug mem leak in git_sequencer_config
sequencer.c: plug leaks in do_pick_commit
submodule--helper: plug mem leak in print_default_remote
refs/packed-backend.c: close fd of empty file

diff --cc builtin/submodule--helper.c
Simple merge

diff --cc sequencer.c
Simple merge