[U-Boot] fs/fat: fix fatbuf leak

[Tom Rini]

On Tue, Sep 12, 2017 at 04:40:01PM -0400, Rob Clark wrote:

> A new fatbuf was allocated by get_fs_info() (called by fat_itr_root()),
> but not freed, resulting in eventually running out of memory.  Spotted
> by running 'ls -r' in a large FAT filesystem from Shell.efi.
> 
> fatbuf is mainly used to cache FAT entry lookups (get_fatent())..
> possibly once fat_write.c it can move into the iterator to simplify
> this.
> 
> Signed-off-by: Rob Clark <robdclark at gmail.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> Reviewed-by: Łukasz Majewski <lukma at denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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