[Bug 233585] sh(1) ${param?} default error message is broken

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233585

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: jilles
Date: Sun Dec  9 19:14:22 UTC 2018
New revision: 341767
URL: https://svnweb.freebsd.org/changeset/base/341767

Log:
  MFC r341164: sh: Fix ${param?} default error message

  If word in ${param?word} is missing, the shell shall write a default error
  message. So expanding ${param?} when param is not set should write an error
  message like

  sh: param: parameter not set

  This was broken by r316417.

  PR:           233585

Changes:
_U  stable/12/
  stable/12/bin/sh/expand.c
  stable/12/bin/sh/tests/expansion/Makefile
  stable/12/bin/sh/tests/expansion/question2.0

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