Change in flashrom[master]: flashrom: Convert do_read() into a libflashrom user

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Edward O'Callaghan, Daniel Campello, Angel Pons.
Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/59291 )

Change subject: flashrom: Convert do_read() into a libflashrom user
......................................................................

Patch Set 4:

(1 comment)

File flashrom.c:

https://review.coreboot.org/c/flashrom/+/59291/comment/47e64d5f_4e5e3355 
PS4, Line 2185: 	ret = write_buf_to_file(buf, size, filename);
> Just add "if (filename)" as in CB:59921

As I already mentioned in CB:59921 the best thing would be to rebase it on the top of this one. If you can do it, would be great!
I would strongly prefer to keep two patches (do not squash into one) because there are two different goals: 1) convert an operation to libflashrom 2) fix a bug.