message: Do not use sys error
diff: @@ -936,7 +936,7 @@ static PHP_METHOD(swoole_http_response, sendfile)
  }
  if (file_stat.st_size == 0)
  {
  - php_swoole_sys_error(E_WARNING, "can't send empty file[%s]", file);
  + php_swoole_error(E_WARNING, "can't send empty file[%s]", file);
  RETURN_FALSE;
  }
  if (file_stat.st_size <= offset)
  @@ -946,7 +946,7 @@ static PHP_METHOD(swoole_http_response, sendfile)
  }
  if (length > file_stat.st_size - offset)
  {
  - php_swoole_sys_error(E_WARNING, "parameter $length[" ZEND_LONG_FMT "] exceeds the file size", length);
  + php_swoole_error(E_WARNING, "parameter $length[" ZEND_LONG_FMT "] exceeds the file size", length);
  RETURN_FALSE;
  }
  if (length == 0)
  