fixed new bug in fn_format()

mysys/mf_format.c:
  fixed a typo bug

mysys/mf_format.c

@@ -99,7 +99,7 @@ my_string fn_format(my_string to, const char *name, const char *dsk,
   if (flag & 16)
   {
     strmov(buff,to);
-    my_symlink(to, buff, MYF(flag & 32 ? 0 : MY_RESOLVE_LINK));
+    my_readlink(to, buff, MYF(flag & 32 ? 0 : MY_RESOLVE_LINK));
   }
   else if (flag & 32)
     my_realpath(to, to, MYF(flag & 32 ? 0 : MY_RESOLVE_LINK));