btrfs: Open code insert_extent_backref
No need to add a level of indirection for hiding a simple 'if'. Open code insert_extent_backref in its sole caller. No functional changes. Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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