Fixes a crash when a virtio-serial port is added without a name to it.
# gpg: Signature made Fri 07 Nov 2014 04:58:05 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-2.2.0-queue-2:
virtio-serial: avoid crash when port has no name
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>