[U-Boot] fs: fat: don't call disk_write with zero sector num

[Tom Rini]

On Wed, Jul 24, 2013 at 05:55:30PM +0800, Wu, Josh wrote:

> In the set_cluster() function, it will convert the buffer size to sector
> numbers. Then call disk_write() to write by sector.
> For remaining buffer, the size is less than a sector, call disk_write()
> again to write them in one sector.
> 
> But if the total buffer size is less then one sector, the original code
> will call disk_write() with zero sector number. It is unnecessary.
> So this patch fix this. Now it will not call disk_write() if total buffer size
> is less than one sector.
> 
> Signed-off-by: Josh Wu <josh.wu at atmel.com>

Applied to u-boot/master, thanks!

-- 
Tom
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