Merge remote-tracking branch 'remotes/armbru/tags/pull-error-2016-02-19' into staging

Error reporting patches for 2016-02-19

# gpg: Signature made Fri 19 Feb 2016 12:47:50 GMT using RSA key ID EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>"

* remotes/armbru/tags/pull-error-2016-02-19:
  vl: Clean up machine selection in main().
  vl: Set error location when parsing memory options
  replay: Set error location properly when parsing options
  vl: Reset location after handling command-line arguments
  vl.c: Fix regression in machine error message

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>