Store the GUID from here as well.

mod/item.php

@@ -864,6 +864,9 @@ function item_post(&$a) {
 		// NOTREACHED
 	}
 
+	// Store the guid and other relevant data
+	add_guid($datarray);
+
 	$post_id = $r[0]['id'];
 	logger('mod_item: saved item ' . $post_id);