[patch] drm/vc4: Return -EFAULT on copy_from_user() failure

[Eric Anholt]

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

> The copy_from_user() function returns the number of bytes not copied but
> we want to return a negative error code.
>
> Fixes: 463873d57014 ('drm/vc4: Add an API for creating GPU shaders in GEM BOs.')
> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

Pulled.  Thanks!
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