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svn:author
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kaktus
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svn:date
V 27
2020-06-21T18:40:17.343423Z
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V 546
net.link.generic.ifdata.<ifindex>.linkspecific: rework handler

This OID was added in r17352 but the write path of IFDATA_LINKSPECIFIC
seems unused as there are no in-base writers, and as far as I can tell
we had issues with this code before, see PR 219472.  Drop the write path
to make the handler read-only as described in comments and man-pages.
It can be marked as MPSAFE now.

Reviewed by:	bdragon, kib, melifaro, wollman
Approved by:	kib (mentor)
Sponsored by:	Mysterious Code Ltd.
Differential Revision:	https://reviews.freebsd.org/D25348

END