fix bug #72490 added methods serialize() and saveTo() to all node

* tree.c: fix bug #72490
* python/libxml.c python/libxml.py: added methods serialize()
  and saveTo() to all node elements.
Daniel
diff --git a/tree.c b/tree.c
index c9a4bfb..3bd3456 100644
--- a/tree.c
+++ b/tree.c
@@ -4718,7 +4718,8 @@
 	    /* exit condition */
 	    if (node == tree) 
 	        node = NULL;
-	}
+	} else
+	    break;
     }
     return(ret);
 }