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887e6b9c45
When an `PHP_OUTPUT_HANDLER_FAILURE` occurs, the output handler becomes disabled (i.e. the `PHP_OUTPUT_HANDLER_DISABLED` flag is set). However, there is no guard for disabled handlers in `php_output_handler_op()` what may cause serious issues (as reported, UB due to passing `NULL` as the 2nd argument of `memcpy`, because the handler's buffer has already been `NULL`ed). Therefore, we add a respective guard for disabled handlers, and return `PHP_OUTPUT_HANDLER_FAILURE` right away. Closes GH-15183.