Merge remote-tracking branch 'remotes/ehabkost/tags/machine-next-pull-request' into...

Machine queue, 2019-01-28

* Fix small leak on NUMA code
* Improve memory backend error messages

# gpg: Signature made Mon 28 Jan 2019 19:42:40 GMT
# gpg:                using RSA key 2807936F984DC5A6
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>" [full]
# Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF  D1AA 2807 936F 984D C5A6

* remotes/ehabkost/tags/machine-next-pull-request:
  hostmem: add more information in error messages
  numa: Fixed the memory leak of numa error message

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