iolog: style updates
authorJens Axboe <axboe@fb.com>
Sun, 7 Aug 2016 21:11:32 +0000 (15:11 -0600)
committerJens Axboe <axboe@fb.com>
Sun, 7 Aug 2016 21:11:32 +0000 (15:11 -0600)
Fixup some slightly off coding style from the histogram logging commit.

Signed-off-by: Jens Axboe <axboe@fb.com>

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