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devclass_alloc_unit: Go back to using M_WAITOK

Description

devclass_alloc_unit: Go back to using M_WAITOK

This restores a change made earlier in f3d3c63442fff.

This reverts commit 234683726708cf5212d672d676d30056d4133859.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D49273

Details