Change in coreboot[master]: lib/malloc: Implement a simple free() only for last malloc()

[Bora Guvendik (Code Review)]

Bora Guvendik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/37919 )

Change subject: lib/malloc: Implement a simple free() only for last malloc()
......................................................................

Patch Set 10:
> Patch Set 10:
> > Patch Set 10:
> >
> > Do you have statistics on different platforms how much memory is successfully freed?
> > Is there a static code analyser to find missing free calls, now that it's doing something useful?
>
> This allows the code in src/commonlib/storage/storage_write.c to not exhaust the heap. With a simple alloc and free pattern. As for finding leaks of the heap w.r.t. missing free() calls that's a different issue all together. Most of the malloc() calls in coreboot are for longer lifetimes, however when there's a succession of malloc() and free() calls it's easy to exhaust the heap.

No, I don't have statistics information, as Aaron mentioned, this is needed so that we don't run out of heap while using storage_block_fill_write().