Merge branch 'am/real-path-fix'

The real_path() convenience function can easily be misused; with a
bit of code refactoring in the callers' side, its use has been
eliminated.

* am/real-path-fix:
  get_superproject_working_tree(): return strbuf
  real_path_if_valid(): remove unsafe API
  real_path: remove unsafe API
  set_git_dir: fix crash when used with real_path()

diff --cc setup.c
Simple merge