staging: comedi: tests: ni_routes_test: Lines should not end with a '('

Fix checkpatch.pl issues such as the following:

CHECK: Lines should not end with a '('
+	unittest(

Cc: Spencer E. Olson <olsonse@umich.edu>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20210407140142.447250-5-abbotti@mev.co.uk


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>