btrfs_record_root_in_trans will return errors in the future, so handle
the error properly in btrfs_recover_log_trees.

This appears tricky, however we have a reference count on the
destination root, so if this fails we need to continue on in the loop to
make sure the proper cleanup is done.
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add comment ]
Signed-off-by: David Sterba <dsterba@suse.com>