staging: comedi: ni_660x: fix memory barrier without comment
Fix the checkpatch.pl issue. Move the memory barrier to a better place. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Reviewed-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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