[patch 3/3 -next] drm/vc4: fix an error code

[Eric Anholt]

Dan Carpenter <dan.carpenter at oracle.com> writes:

> "exec->exec_bo" is NULL at this point so this code returns success.  We
> want to return -ENOMEM.
>
> Fixes: d5b1a78a772f ('drm/vc4: Add support for drawing 3D frames.')
> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

Thanks!  All 3 of these are Reviewed-by: Eric Anholt <eric at anholt.net>

I've pulled them to my -next tree, which I'll send to Dave once we get
the CONFIG_PM_SLEEP bits sorted out.
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