qxl: fix segfault
# gpg: Signature made Fri 27 Nov 2020 07:06:51 GMT
# gpg: using RSA key
4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" [full]
# gpg: aka "Gerd Hoffmann <gerd@kraxel.org>" [full]
# gpg: aka "Gerd Hoffmann (private) <kraxel@gmail.com>" [full]
# Primary key fingerprint: A032 8CFF B93A 17A7 9901 FE7D 4CB6 D8EE D3E8 7138
* remotes/kraxel/tags/fixes-
20201127-pull-request:
qxl: fix segfault
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>