FreeBSD_HEAD_arm64 - Build #2203 - Fixed

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FreeBSD_HEAD_arm64 - Build #2203 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2203/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2203/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2203/console

Change summaries:

294655 by pfg:
ext2: rename some directory index constants.

Missed from r294653.

Pointyhat:	me