Staging: comedi : fix brace coding style issue in wwrap.c

This is a patch to the wwrap.c file that fixes up a brace warnings and
other errors found by the checkpatch.pl tool.

Signed-off-by: Daniele Boncompagni <daniele.boncompagni@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>