raid5-cache: inline r5l_alloc_io_unit into r5l_new_meta
This is the only user, and keeping all code initializing the io_unit structure together improves readbility. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NShaohua Li <shli@fb.com> Signed-off-by: NNeilBrown <neilb@suse.com>
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