btrfs: raid56: simplify code flow in rmw_rbio
Remove the write goto label by moving the data page allocation and data read into the branch. Reviewed-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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