qxl: add sanity check
# gpg: Signature made Mon 24 Feb 2014 12:01:27 GMT using RSA key ID
D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg: aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg: aka "Gerd Hoffmann (private) <kraxel@gmail.com>"
* remotes/spice/tags/pull-spice-3:
qxl: add sanity check
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>