[coreboot-gerrit] Change in em100[master]: Cleanly detach em100 in case of error

[Angel Pons (Code Review)]

Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/em100/+/47845 )

Change subject: Cleanly detach em100 in case of error
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Patch Set 1: Code-Review+2
> Patch Set 1:
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> Yeah... I'm trying to figure out if atexit() can do the job. Same potentially for all the free() calls. But I think it still makes to submit this until then

Even just splitting main() into a helper subroutine would do the trick, I think.