Change in flashrom[master]: libflashrom: Return progress state to the library user

[Edward O'Callaghan (Code Review)]

Attention is currently required from: Richard Hughes, Angel Pons, Anastasia Klimchuk, Patrick Rudolph.
Edward O'Callaghan has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/49643 )

Change subject: libflashrom: Return progress state to the library user
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Patch Set 4:

(1 comment)

File libflashrom.c:

https://review.coreboot.org/c/flashrom/+/49643/comment/ae954e24_dea0062a 
PS4, Line 113: private
> This function doesn't look to be private, it is called outside of this file.
> private from the libflashrom API, as in "internal" to the flashrom implementation. Not to mean static local. private is a bit of a overloaded term [sic. java/c++].