[PATCH] drm/vkms: Fix plane duplicate_state

[Eric Anholt]

Daniel Vetter <daniel.vetter at ffwll.ch> writes:

> We need to handle allocation failures and bail out. While at it, tune
> the allocation failures down to debug level.
>
> syzbot injected an allocation failure and then hit this WARN_ON.

r-b.

I also often don't add kmalloc failure messages, since it's rare and
spits a warning anyway.
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