[U-Boot] fs/fat: Correct blk_dread() return value check

[Tom Rini]

On Mon, Aug 14, 2017 at 09:02:08PM -0400, Tom Rini wrote:

> The function blk_dread will return -ENOSYS on failure or on success the
> number of blocks read, which must be the number asked to read (otherwise
> it failed somewhere).  Correct this check.
> 
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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