add removable xml hook bindings (oops forgot one line)

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@8906 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_xml.cpp

@@ -159,6 +159,7 @@ SWITCH_DECLARE(switch_status_t) switch_xml_unbind_search_function(switch_xml_bin
 			status = SWITCH_STATUS_SUCCESS;
 			break;
 		}
+		last = ptr;
 	}
 	switch_mutex_unlock(XML_LOCK);