vmwgfx: return an -EFAULT if copy_to_user() fails
copy_to_user() returns the number of bytes remaining to be copied, but we want to return a negative error code here. I fixed a couple of these last year, but I missed this one. Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Reviewed-by: NThomas Hellstrom <thellstrom@vmware.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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