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Widen ifnet_detach_sxlock coverage
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Authored by kp on Feb 8 2021, 10:07 AM.
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Summary

Widen the ifnet_detach_sxlock to cover the entire vnet sysuninit code.
This ensures that we can't end up having the vnet_sysuninit free the UDP
pcb while the detach code is running and trying to purge the UDP pcb.

MFC after: 1 week

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rG FreeBSD src repository
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