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blk_iocost_init() forgot to free its percpu stat on the error path.
Fix it.

Fixes: 7caa4715

 ("blkcg: implement blk-iocost")
Reported-by: Hillf Danton <hdanton@sina.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>