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

[Bora Guvendik (Code Review)]

Hello Thejaswani Putta, Aaron Durbin, Subrata Banik, Selma Bensaid, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/37919

to look at the new patch set (#10).

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

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

Implement a free() that supports only the last malloc(). Rewind
the heap to the last allocation point if the ptr to be freed is
matching the end of heap before last malloc(). With current situation,
since free() is no-op, every call to malloc() is a memory leak.

BUG=b:140124451
TEST=Wrote a test function to do malloc and free operations.

Change-Id: I6d43cf54b79e6897cf6882335730b2310e4eae45
Signed-off-by: Bora Guvendik 
---
M src/include/stdlib.h
M src/lib/malloc.c
2 files changed, 30 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/19/37919/10