btrfs: reloc: open code read_fs_root() for handle_indirect_tree_backref()

The backref code is going to be moved to backref.c, and read_fs_root()
is just a simple wrapper, open-code it to prepare to the incoming code
move.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2020-03-05 15:16:09 +08:00 • committed by David Sterba
commit d36e7f0e8f