FreeBSD_HEAD_arm64 - Build #2917 - Fixed

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FreeBSD_HEAD_arm64 - Build #2917 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2917/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2917/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2917/console

Change summaries:

298257 by delphij:
Fix build breakage introduced by r298253.

298256 by araujo:
Use nitems() from sys/param.h.

MFC after:	2 weeks.

298255 by araujo:
Use nitems() from sys/param.h.

MFC after:	2 weeks.