FreeBSD_HEAD_arm64 - Build #2740 - Fixed

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FreeBSD_HEAD_arm64 - Build #2740 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2740/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2740/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/2740/console

Change summaries:

297409 by adrian:
[bwn] fix time_before -> ieee80211_time_before()

Noticed by: Jia-Shiun Li <jiashiun at gmail.com>

297408 by pfg:
freopen(3): prevent uninitialized errno.

Revert r297407 and redo it cleanly.

Pointed out by:	Jukka A. Ukkonen
CID:		1018720
MFC after:	1 week