[S] Change in flashrom[master]: tests: Add workaround to allow tests mock fileno on FreeBSD

[Peter Marheine (Code Review)]

Attention is currently required from: Thomas Heijligen, Anastasia Klimchuk.

Peter Marheine has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/67312 )

Change subject: tests: Add workaround to allow tests mock fileno on FreeBSD
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Patch Set 2:

(1 comment)

File tests/chip.c:

https://review.coreboot.org/c/flashrom/+/67312/comment/d8f51eba_088822c7 
PS2, Line 161: 	__isthreaded = 0;
I don't think we should do this, since it's possible at this point that another thread has been created. `__isthreaded == 0` is just a performance optimization so it's fine to leave it once we've set it and clearing it again might be unsafe.