Make td_io_u_lock/unlock() explicit
authorJens Axboe <axboe@kernel.dk>
Sat, 25 Aug 2018 16:22:31 +0000 (10:22 -0600)
committerJens Axboe <axboe@kernel.dk>
Sat, 25 Aug 2018 16:22:31 +0000 (10:22 -0600)
Hopefully this will make coverity a little happier, it currently
thinks they are unbalanced.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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