Merge branch 'rs/cleanup-strbuf-users'

Code clean-up.

* rs/cleanup-strbuf-users:
  graph: use strbuf_addchars() to add spaces
  use strbuf_addstr() for adding strings to strbufs
  path: use strbuf_add_real_path()

diff --cc builtin/branch.c
Simple merge

diff --cc path.c
Simple merge

diff --cc refs/packed-backend.c
Simple merge

diff --cc sequencer.c
Simple merge