[U-Boot] ext4: Fix handling of sparse files

[Tom Rini]

On Sat, Nov 05, 2016 at 10:17:14PM +0100, Stefan Brüns wrote:

> A sparse file may have regions not mapped by any extents, at the start
> or at the end of the file, or anywhere between, thus not finding a
> matching extent region is never an error.
> 
> Found by python filesystem tests.
> 
> Signed-off-by: Stefan Brüns <stefan.bruens at rwth-aachen.de>

Applied to u-boot/master, thanks!

-- 
Tom
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