[S] Change in flashrom[master]: flashrom.c:Add function to align region to sector boundaries

[Edward O'Callaghan (Code Review)]

Attention is currently required from: Aarya.

Edward O'Callaghan has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/65642 )

Change subject: flashrom.c:Add function to align region to sector boundaries
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Patch Set 58:

(2 comments)

File flashrom.c:

https://review.coreboot.org/c/flashrom/+/65642/comment/2d6baeb6_5673e171 
PS57, Line 1183: layout[i].layout_list[j]
> intermediate to the inner for-loop construct?

for example, something like;
```
for (size_t j = 0; j < layout[i].block_count; j++) {
   const struct eraseblock_data *ll = &layout[i].layout_list[j];

if (ll->start_addr <= *region_start)
     start_diff = (*region_start - ll->start_addr) > start_diff ? start_diff : (*region_start - ll->start_addr);

[..]
}
```

File flashrom.c:

https://review.coreboot.org/c/flashrom/+/65642/comment/514afdb9_71d5afe1 
PS58, Line 1181: int
also indexing array's with `unsigned int`