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libnv: Allow use in non-sleepable contexts
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Authored by kp on Apr 2 2021, 6:54 PM.

Details

Summary

44c125c4cebc2fd87c6260b90eddae11201f5232 switched the nvlist allocations
to be M_WAITOK, but this precludes the use in non-sleepable contexts.
(E.g. with a nonsleepable lock held).

All callers for these allocation functions already cope with memory
alloation failures, so there's no reason to allow sleeping during
allocations.

MFC after: 1 week
Sponsored by: Rubicon Communications, LLC ("Netgate")

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R10 FreeBSD src repository
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