staging: comedi: amplc_pci224: fix spinlock_t definition without comment

Fix checkpatch issue: "CHECK: spinlock_t definition without comment".

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 file changed