[U-Boot] fs: btrfs: Fix tree traversal with btrfs_next_slot()

[Tom Rini]

On Fri, Sep 07, 2018 at 12:59:30PM +0300, Yevgeny Popovych wrote:

> When traversing slots in a btree (via btrfs_path) with btrfs_next_slot(),
> we didn't correctly identify that the last slot in the leaf was reached
> and we should jump to the next leaf.
> 
> This could lead to any kind of runtime errors or corruptions, like:
> * file data not being read at all, or is read partially
> * file is read but is corrupted
> * (any) metadata being corrupted or not read at all, etc
> 
> The easiest way to reproduce this is to read a large enough file that
> its EXTENT_DATA items don't fit into a single leaf.
> 
> Signed-off-by: Yevgeny Popovych <yevgenyp at pointgrab.com>
> Cc: Marek Behun <marek.behun at nic.cz>
> Tested-by: Marek Behún <marek.behun at nic.cz>

Applied to u-boot/master, thanks!

-- 
Tom
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