fmt_ulong did not output '0' properly.

CHANGES

@@ -1,5 +1,6 @@
 0.6:
   changed name to libowfat
+  fixed fmt_ulong (did not output 0 correctly)
 
 0.5:
   made subdirectories for the different libraries.

fmt/fmt_ulong.c

@@ -1,11 +1,11 @@
 #include "fmt.h"
 
 unsigned int fmt_ulong(char *dest,unsigned long i) {
-  register unsigned long len,tmp;
+  register unsigned long len,tmp,len2;
   /* first count the number of bytes needed */
   for (len=1, tmp=i; tmp>9; ++len) tmp/=10;
   if (dest)
-    for (tmp=i, dest+=len; tmp; tmp/=10)
+    for (tmp=i, dest+=len, len2=len+1; --len2; tmp/=10)
       *--dest = (tmp%10)+'0';
   return len;
 }