examples/elements.c: Address compile warning on sign mismatch

examples/elements.c: In function ‘main’:
examples/elements.c:54:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     done = len < sizeof(buf);
                ^
1 file changed
tree: a2213a2f7557e6458b2b09e3f4bc9e2d6e8c3e48
  1. .gitignore
  2. expat/
  3. htdocs/
  4. testdata/