Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20181114' into staging

Fix error handling during zpci device creation.

# gpg: Signature made Wed 14 Nov 2018 10:08:43 GMT
# gpg:                using RSA key DECF6B93C6F02FAF
# gpg: Good signature from "Cornelia Huck <[email protected]>"
# gpg:                 aka "Cornelia Huck <[email protected]>"
# gpg:                 aka "Cornelia Huck <[email protected]>"
# gpg:                 aka "Cornelia Huck <[email protected]>"
# gpg:                 aka "Cornelia Huck <[email protected]>"
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck/tags/s390x-20181114:
  s390x/pci: properly fail if the zPCI device cannot be created

Signed-off-by: Peter Maydell <[email protected]>