Rewrite subtraction in core/rtw_cmd.c to clear missing spaces around operator reported by checkpatch. 256-1 -> 255 Signed-off-by: Michael Straube <straube.linux@gmail.com> Link: https://lore.kernel.org/r/20210816155818.24005-3-straube.linux@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>