Staging: winbond: fix brace and space coding style issue in mac_structures.h

This is a patch to the mac_structures.h file that fixed up a brace and
space Errors found by the checkpatch.pl tool.

Signed-off-by: Ruslan Pisarev <ruslan@rpisarev.org.ua>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>