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git2svn
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2021-04-15T23:06:02.038501Z
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sys/ck.h: Add an include guard

Approved by:	cognet
MFC after:	1 week
Sponsored by:	BBOX.io
Differential Revision:	https://reviews.freebsd.org/D29357

(cherry picked from commit 2595d78f3df2ca389aae259a291f93eb06ecad43)

Git Hash:   a1f4a2d6be36392dbf477b8d287cc5145593cfb0
Git Author: kbowling@FreeBSD.org
END