staging: comedi: mite.h: tidy up mite_csigr_wpdep()

Refactor this inline function to fix the checkpatch.pl warnings:

WARNING: Missing a blank line after declarations
WARNING: else is not generally useful after a break or return

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