fmt_long did not count the '-'

CHANGES

@@ -1,3 +1,7 @@
+0.11:
+  fix fmt_long (didn't count the '-'), which in turn broke
+    buffer_putlong
+
 0.10:
   add comment to stralloc.h that explains the structure (Markus Brischke)
   fix socket routines (two cut-and-paste errors)

fmt/fmt_long.c

@@ -3,7 +3,7 @@
 unsigned int fmt_long(char *dest,long int i) {
   if (i<0) {
     if (dest) *dest='-';
-    return fmt_ulong(dest+1,-i);
+    return fmt_ulong(dest+1,-i)+1;
   } else
     return fmt_ulong(dest,i);
 }