btrfs: Remove btrfs_bio::flags member
The last user of btrfs_bio::flags was removed in commit 326e1dbb ("block: remove management of bi_remaining when restoring original bi_end_io"), remove it. (Tagged for stable as the structure is heavily used and space savings are desirable.) CC: stable@vger.kernel.org # 4.4+ Signed-off-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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