[PATCH]Possible out of bounds array access in mieqEnqueue()

[Luo Jie]

Function mieqEnqueue() in mi/mieq.c have possibility of out of bound 
array access. When oldtail == 0, laste = &miEventQueue.events[oldtail 
-1] is not a valid access to miEventQueue.events.
Here is a patch to fix this *except* the case that the first event 
insert using mieqEnqueue() has type DeviceValuator.

Any idea?
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