md/raid10: factor out code from wait_barrier() to stop_waiting_barrier()
Currently the nasty condition in wait_barrier() is hard to read. This patch factors out the condition into a function. There are no functional changes. Signed-off-by: NYu Kuai <yukuai3@huawei.com> Acked-by: NPaul Menzel <pmenzel@molgen.mpg.de> Reviewed-by: NLogan Gunthorpe <logang@deltatee.com> Acked-by: NGuoqing Jiang <guoqing.jiang@linux.dev> Signed-off-by: NSong Liu <song@kernel.org>
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