staging: comedi: pcl816: if test should use logical OR not bitwise OR

This quiets a couple sparse warnings about:

warning: dubious: !x | !y
warning: dubious: x | !y

Also, remove the unnecessary parentheses abound the variables.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>