multiplier suffixes are short, store them directly in struct suffix_mult

function                                             old     new   delta
xstrtoul_range_sfx                                   226     217      -9
xstrtoull_range_sfx                                  291     280     -11
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-20)             Total: -20 bytes
   text    data     bss     dec     hex filename
 669128    2668   13616  685412   a7564 busybox_old
 669108    2668   13616  685392   a7550 busybox_unstripped

diff --git a/coreutils/sleep.c b/coreutils/sleep.c
index e9a30da..26cdbc4 100644
--- a/coreutils/sleep.c
+++ b/coreutils/sleep.c
@@ -29,7 +29,7 @@
 	{ "m", 60 },
 	{ "h", 60*60 },
 	{ "d", 24*60*60 },
-	{ NULL, 0 }
+	{ }
 };
 #endif