Merge remote-tracking branch 'remotes/dgilbert/tags/pull-hmp-20170331' into staging

HMP pull (one bugfix)

# gpg: Signature made Fri 31 Mar 2017 11:57:17 BST
# gpg:                using RSA key 0x0516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>"
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert/tags/pull-hmp-20170331:
  hmp: fix "dump-quest-memory" segfault

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