btrfs: stop using the btrfs_bio saved iter in index_rbio_pages
The bios added to ->bio_list are the original bios fed into btrfs_map_bio, which are never advanced. Just use the iter in the bio itself. Reviewed-by: NQu Wenruo <wqu@suse.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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