[S] Change in coreboot[main]: cbmem.h: Change return type of cbmem_get_region

[Nico Huber (Code Review)]

Attention is currently required from: Angel Pons, Arthur Heymans, Christian Walter, Jakub Czapiga, Johnny Lin, Jonathan Zhang, Jérémy Compostella, Lean Sheng Tan, Patrick Rudolph, Shuo Liu, Tim Chu.

Nico Huber has posted comments on this change by Arthur Heymans. ( https://review.coreboot.org/c/coreboot/+/84039?usp=email )

Change subject: cbmem.h: Change return type of cbmem_get_region
......................................................................

Patch Set 7: Code-Review+1

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/84039/comment/df136086_954a6f99?usp... :
PS6, Line 13: checked for NULL later.
So it realized thanks to LTO that we didn't consistently initialize
variables, is that right? That would make this change actually fix
something and worth to mention.