[U-Boot] fs: btrfs: Do not fail when all root_backups are empty

[Tom Rini]

On Mon, Jun 11, 2018 at 02:14:33PM +0300, Yevgeny Popovych wrote:

> This is the case when reading freshly created filesystem.
> The error message is like the following:
>     btrfs_read_superblock: No valid root_backup found!
> 
> Since the data from super_roots/root_backups is not actually used -
> decided to rework btrfs_newest_root_backup() into
> btrfs_check_super_roots() that will only check if super_roots
> array is valid and correctly handle empty scenario.
> 
> As a result:
> * btrfs_read_superblock() now only checks if super_roots array is valid;
>   the case when it is empty is considered OK.
> * removed root_backup pointer from btrfs_info,
>   which would be NULL in case of empty super_roots.
> * btrfs_read_superblock() verifies number of devices from the superblock
>   itself, not newest root_backup.
> 
> Signed-off-by: Yevgeny Popovych <yevgenyp at pointgrab.com>
> Cc: Marek Behun <marek.behun at nic.cz>
> Cc: Sergey Struzh <sergeys at pointgrab.com>

Applied to u-boot/master, thanks!

-- 
Tom
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