Comment 2 for bug 1823422

Hmm, also ugly:

test-normalize.c: In function ‘main’:
test-normalize.c:159:49: warning: ‘__builtin___snprintf_chk’ output may be truncated before the last format character [-Wformat-truncation=]
      snprintf(longname, sizeof(longname), "%s/%s", srcdir, filename);
                                                 ^
In file included from /usr/include/stdio.h:867,
                 from test-normalize.c:37:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:67:10: note: ‘__builtin___snprintf_chk’ output 2 or more bytes (assuming 257) into a destination of size 256
   return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        __bos (__s), __fmt, __va_arg_pack ());
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~