Staging: comedi: fixed warnings reported by checkpatch tool on comedi_test.c file

This is a patch to remove warnings reported by checkpatch tool on
comedi_test.c file

Signed-off-by: Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>