cfq-iosched: make code consistent
ioc->ioc_data is rcu protectd, so uses correct API to access it. This doesn't change any behavior, but just make code consistent. Signed-off-by: NShaohua Li <shaohua.li@intel.com> Cc: stable@kernel.org # after ab4bd22dSigned-off-by: NJens Axboe <jaxboe@fusionio.com>
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