qxl: check for NULL return from qxl_phys2virt
Signed-off-by: NAlon Levy <alevy@redhat.com> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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Signed-off-by: NAlon Levy <alevy@redhat.com> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>