/* The head of the list of freed log_streams indexes in log_streams.ptr (~0U if none free).
* Freed positions in log_streams.ptr are connected into a linked list in the following way:
* log_streams.ptr[log_streams_free].levels is the index of next freed position (or ~0U) */
/* The head of the list of freed log_streams indexes in log_streams.ptr (~0U if none free).
* Freed positions in log_streams.ptr are connected into a linked list in the following way:
* log_streams.ptr[log_streams_free].levels is the index of next freed position (or ~0U) */