LU-14024 ofd: Avoid use after free in ofd_inconsistency_verification_main

LU-14024 ofd: Avoid use after free in ofd_inconsistency_verification_main

The ofd_inconsistency_lock should not be unlocked after we woken up
a different thread that is going to free the structure containing
said lock.

Change-Id: I913e7470664e1128a250597b0a803f791d99099e
Signed-off-by: Oleg Drokin <green@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/40222
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>