umount not working

[Doom Neine]

hello all,
i'm running a 5.2.1 release which was last updated,
using freebsd-update, to cover the tcp problem and
i've noticed that i can no longer use umount, when i
try umount /var/
i get this message:

/sbin/umount: Exec format error. Binary file not
executable

anyway i'm pretty new to tracking current so any help
on what to do about that or how to get more
information to post so that those of you who are more
proficient than me can look at please pass it along

thanks

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