Merge remote-tracking branch 'remotes/amit/tags/vser-for-2.3-1' into staging

virtio-serial: fix crash on port hotplug when a previously-added port
did not have the 'name' property set.

# gpg: Signature made Wed Mar 11 11:13:53 2015 GMT using RSA key ID 854083B6
# gpg: Good signature from "Amit Shah <amit@amitshah.net>"
# gpg:                 aka "Amit Shah <amit@kernel.org>"
# gpg:                 aka "Amit Shah <amitshah@gmx.net>"

* remotes/amit/tags/vser-for-2.3-1:
  virtio-serial: fix segfault on NULL port names

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