Staging: rtl8188eu: Fixed coding style issues

Fixed required and prohibited spaces to make rtw_io.h checkpatch.pl clean

Signed-off-by: Tim Jester-Pfadt <t.jp@gmx.de>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>