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dmabuf: Avoid division by 0

Bilal Elmoussaoui requested to merge bilelmoussaoui/libmks:bilelmoussaoui/dmabuf-division-0 into main

When opening mks for an already running VM, the QEMU dbus backend has no way to tell to the VM refresh the display and submit a new UpdateDMABuf.

So by the time size_allocate is called, the height and width of the paintable are still set to 0.

This should fix the size allocate warning we see now until we figure out a proper fix from the QEMU side.

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