dix: null out dummyDev, otherwise Xephyr dereferences random pointers.
SendEventToAllWindow eventually causes a IsInterferingGrab(), which attempts to dereference dev->deviceGrab.grab.
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@ -376,7 +376,8 @@ ActivateDevice(DeviceIntPtr dev)
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ev.time = currentTime.milliseconds;
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ev.devchange = DeviceAdded;
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ev.deviceid = dev->id;
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dummyDev.id = 0;
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memset(&dummyDev, 0, sizeof(DeviceIntRec));
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SendEventToAllWindows(&dummyDev, DevicePresenceNotifyMask,
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(xEvent *) &ev, 1);
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