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Fix an msleep() that can use different mutexes to avoid assert panic
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Authored by rmacklem on Oct 13 2022, 3:02 AM.
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Details

Summary

During recent testing as part of an IETF NFSv4 testing event,
I got an assert panic in sleepq_add(), due to a call with a
different mutex for the same wchan.

This turned out to be harmless, since the msleep() is on
a fake wchan that never gets a wakeup() and is simply a
time delay sleep.

To avoid the assert panic, this patch replaces the msleep()
with a tsleep().

Test Plan

With this patch, the test runs no longer assert panic'd.

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rG FreeBSD src repository
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