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avos
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svn:date
V 27
2017-10-21T10:48:06.379510Z
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V 338
MFC r324672:
ifnet(9): split ifc_alloc_unit() (should simplify code flow)

Allocate smallest unit number from pool via ifc_alloc_unit_next()
and exact unit number (if available) via ifc_alloc_unit_specific().

While here, address possible deadlock (mentioned in PR).

PR:		217401
Differential Revision:	https://reviews.freebsd.org/D12551

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