Merge remote-tracking branch 'remotes/ehabkost/tags/x86-next-pull-request' into staging

Fix memory leaks when using object_property_get_str()

# gpg: Signature made Tue 03 Apr 2018 15:00:10 BST
# gpg:                using RSA key 2807936F984DC5A6
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>"
# Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF  D1AA 2807 936F 984D C5A6

* remotes/ehabkost/tags/x86-next-pull-request:
  sev/i386: fix memory leak in sev_guest_init()
  exec: fix memory leak in find_max_supported_pagesize()

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