- Drop second superflous zval_ptr_dtor in string arg parsing

Zend/zend_API.c

@@ -375,7 +375,6 @@ static char *zend_parse_arg_impl(int arg_num, zval **arg, va_list *va, char **sp
 								*p = Z_STRVAL_PP(arg);
 								break;
 							}
-							zval_ptr_dtor(arg);
 						}
 					}