block: add __init to elv_register
elv_register is only called by elevator init functions: __init cfq_init __init deadline_init __init noop_init Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: NFabian Frederick <fabf@skynet.be> Signed-off-by: NJens Axboe <axboe@fb.com>
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