message: check_format: don't error if clang-format-9 is in PATH under home
diff: @@ -214,7 +214,7 @@ def readFile(path):
  # environment variable. If it cannot be found, empty string is returned.
  def lookPath(executable):
  for path_dir in os.environ["PATH"].split(os.pathsep):
  - executable_path = os.path.join(path_dir, executable)
  + executable_path = os.path.expanduser(os.path.join(path_dir, executable))
  if os.path.exists(executable_path):
  return executable_path
  return ""
  