Neither WCMD_give_help(), nor WCMD_setshow_default() are ever called
with a NULL pointer (notice how WCMD_skip_leading_spaces() already
assumes its argument is not NULL and does not return NULL).
Signed-off-by: Francois Gouget <fgouget@free.fr>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>