staging: comedi: ni_660x: add comments for the spinlock_t definitions

Fix the checkpatch.pl issues:

CHECK: spinlock_t definition without comment

For aesthetics, rename the 'soft_reg_copy_lock' to clarify what it's
used for.

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>
1 file changed