Example: Fix warning (#1049)

examples/embed_certificate/ec_example.c

@@ -275,7 +275,7 @@ request_handler(struct mg_connection *conn, void *cbdata)
 	 * value. Thus, we count the number of times a client visited this a
 	 * page generated by this handler function. */
 	char new_cookie[32];
-	sprintf(new_cookie, "c=%u", cookie_number + 1);
+	sprintf(new_cookie, "c=%lu", cookie_number + 1);
 
 	/* Generate a response text and status code. */
 	int status;
@@ -284,7 +284,7 @@ request_handler(struct mg_connection *conn, void *cbdata)
 	if (uri_len <= 100) {
 		status = 200; /* 200 = OK */
 		sprintf(response,
-		        "Hello at %s\nYou have visited %u sites here before!",
+		        "Hello at %s\nYou have visited %lu sites here before!",
 		        ri->local_uri,
 		        cookie_number);
 	} else {
@@ -294,9 +294,9 @@ request_handler(struct mg_connection *conn, void *cbdata)
 	}
 
 	/* This sequence can be used to send a response including a cookie. */
-	unsigned content_len = (unsigned)strlen(response);
+	unsigned long content_len = (unsigned long)strlen(response);
 	char content_len_text[32];
-	sprintf(content_len_text, "%u", content_len);
+	sprintf(content_len_text, "%lu", content_len);
 
 	mg_response_header_start(conn, status);
 	mg_response_header_add(conn, "Set-Cookie", new_cookie, -1);