From 8c6f373b98cb29627c9e5146f66c4ba170edf18f Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Mon, 7 Dec 2015 16:42:39 +0100
Subject: [PATCH] sys: fmt: fix converting "0" in fmt_u32_dec()

---
 sys/fmt/fmt.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/sys/fmt/fmt.c b/sys/fmt/fmt.c
index 803b1e0d63..9f79036178 100644
--- a/sys/fmt/fmt.c
+++ b/sys/fmt/fmt.c
@@ -93,10 +93,9 @@ size_t fmt_u32_dec(char *out, uint32_t val)
 
     if (out) {
         char *ptr = out + len;
-        while(val) {
+        do {
             *--ptr = (val % 10) + '0';
-            val /= 10;
-        }
+        } while ((val /= 10));
     }
 
     return len;