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由 Anthony Liguori 提交于
My previous commit, f92f8afe, broke -vnc (spotted by Glauber Costa). This is because it's necessary to tell when the no special display parameters have been passed and default to SDL or VNC appropriately. This refactors the display selection logic to be less complicated which has the effect of fixing the regression mentioned above. Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
993fbfdb