In "btrfs: send: lower memory requirements in common case" the code to
save the old_buf_len was incorrectly moved to a wrong place and broke
the original logic.
Reported-by: NFilipe David Manana <fdmanana@gmail.com>
Signed-off-by: NDavid Sterba <dsterba@suse.cz>
Reviewed-by: NFilipe David Manana <fdmanana@gmail.com>
Signed-off-by: NJosef Bacik <jbacik@fb.com>