Merge branch 'rs/usage-fallback-to-show-message-format'

vreportf(), which is usede by error() and friends, has been taught
to give the error message printf-format string when its vsnprintf()
call fails, instead of showing nothing useful to identify the
nature of the error.

* rs/usage-fallback-to-show-message-format:
  usage: report vsnprintf(3) failure