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 files changed, 1 insertions, 1 deletions

diff --git a/expat/examples/elements.c b/expat/examples/elements.c
index 6b8f8550..bc04b6b1 100644
--- a/expat/examples/elements.c
+++ b/expat/examples/elements.c
@@ -50,7 +50,7 @@ main(int argc, char *argv[])
   XML_SetUserData(parser, &depth);
   XML_SetElementHandler(parser, startElement, endElement);
   do {
-    int len = (int)fread(buf, 1, sizeof(buf), stdin);
+    size_t len = fread(buf, 1, sizeof(buf), stdin);
     done = len < sizeof(buf);
     if (XML_Parse(parser, buf, len, done) == XML_STATUS_ERROR) {
       fprintf(stderr,