btrfs: don't init io tree with private data for non-inodes

We only use this for normal inodes, so don't set it if we're not a
normal inode.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>