btrfs: remove btrfs_bio_end_io_t
The btrfs_bio_end_io_t typedef was introduced with commit a1d3c478 ("btrfs: btrfs_multi_bio replaced with btrfs_bio") but never used anywhere. This commit also introduced a forward declaration of 'struct btrfs_bio' which is only needed for btrfs_bio_end_io_t. Remove both as they're not needed anywhere. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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