Merge branch 'stat-parsing' of https://github.com/t-8ch/util-linux

* 'stat-parsing' of https://github.com/t-8ch/util-linux:
  procfs: get_stat_nth: handle braces in process name
  lib: procfs: add parsing cmd containing newline
  lib: procfs: add unittests
  lib: procfs: prefix support for tests
  lib: procfs: fix error message during test
  lib: procfs: fix typo in argument specification
  lib: procfs: clarify name of procfs_process_get_data_for()