Move the escaping into get_guid() so we don't have to repeat ourselves. See #13555.

git-svn-id: https://develop.svn.wordpress.org/trunk@14949 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/post-template.php

@@ -127,13 +127,15 @@ function get_the_title( $id = 0 ) {
  * The guid will appear to be a link, but should not be used as an link to the
  * post. The reason you should not use it as a link, is because of moving the
  * blog across domains.
+ * 
+ * Url is escaped to make it xml safe
  *
  * @since 1.5.0
  *
  * @param int $id Optional. Post ID.
  */
 function the_guid( $id = 0 ) {
-	echo get_the_guid($id);
+	echo esc_url( get_the_guid($id) );
 }
 
 /**