Change in flashrom[master]: libflashrom/fmap: Don't use off_t for flash offsets

[Edward O'Callaghan (Code Review)]

Attention is currently required from: Nico Huber, David Hendricks, Julius Werner, Angel Pons, Arthur Heymans.
Edward O'Callaghan has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/61943 )

Change subject: libflashrom/fmap: Don't use off_t for flash offsets
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Patch Set 1: Code-Review+2

(1 comment)

Patchset:

PS1:
> ... […]

I ran into this problem today from `elogtool list` breaking is a truly bizarre way with "Out of memory". It wasted a fair amount of time until when I saw:

```
flashrom_layout_read_fmap_from_rom: offset=8388608 and len=0.
fmap_read_from_rom: offset=0 and len=-178828444.
```

it suddenly clicked that this looked like something familiar ;)

This patches resolved the issue.