[faiproject/fai] 700cc5: better error message

[Mrfai]

  Branch: refs/heads/master
  Home:   https://github.com/faiproject/fai
  Commit: 700cc5ffc7d988d517568da7cae09a52ea1d2c87
      https://github.com/faiproject/fai/commit/700cc5ffc7d988d517568da7cae09a52ea1d2c87
  Author: Thomas Lange <lange at debian.org>
  Date:   2020-10-27 (Tue, 27 Oct 2020)

  Changed paths:
    M lib/subroutines

  Log Message:
  -----------
  better error message


  Commit: f67bf55e15ff141a4366356becb2a87df0328136
      https://github.com/faiproject/fai/commit/f67bf55e15ff141a4366356becb2a87df0328136
  Author: Thomas Lange <lange at debian.org>
  Date:   2020-11-20 (Fri, 20 Nov 2020)

  Changed paths:
    M bin/fai-make-nfsroot

  Log Message:
  -----------
  fix syntax error


Compare: https://github.com/faiproject/fai/compare/290e11dfcb57...f67bf55e15ff