Fix signed/unsigned warnings in clean_text.cc and find_links.cc examples.

Author: nostrademons

examples/clean_text.cc

@@ -31,7 +31,7 @@ static std::string cleantext(GumboNode* node) {
              node->v.element.tag != GUMBO_TAG_STYLE) {
     std::string contents = "";
     GumboVector* children = &node->v.element.children;
-    for (int i = 0; i < children->length; ++i) {
+    for (unsigned int i = 0; i < children->length; ++i) {
       const std::string text = cleantext((GumboNode*) children->data[i]);
       if (i != 0 && !text.empty()) {
         contents.append(" ");

examples/find_links.cc

@@ -35,7 +35,7 @@ static void search_for_links(GumboNode* node) {
   }
 
   GumboVector* children = &node->v.element.children;
-  for (int i = 0; i < children->length; ++i) {
+  for (unsigned int i = 0; i < children->length; ++i) {
     search_for_links(static_cast<GumboNode*>(children->data[i]));
   }
 }