Change in flashrom[master]: tests/: Add file path and flags validation to open() calls

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Sam McNally, Edward O'Callaghan, Daniel Campello.
Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/62320 )

Change subject: tests/: Add file path and flags validation to open() calls
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Patch Set 14:

(2 comments)

File tests/chip.c:

https://review.coreboot.org/c/flashrom/+/62320/comment/311bd758_ccbea199 
PS14, Line 201: io_mock_register(&chip_io);
`io_mock_register(&chip_io)` can be moved into `setup_chip`. That would need one more argument for setup_chip, to pass chip_io, because it is not exactly the same for all tests. But at least registration (and de-registration) can be moved to a common place, setup/teardown.

https://review.coreboot.org/c/flashrom/+/62320/comment/f1c26173_6f82bffc 
PS14, Line 216: io_mock_register(NULL);
`io_mock_register(NULL)` can be moved into `teardown` because it just repeats at the end of each test.