[U-Boot] mtdparts: Fix final outstanding issue reported by Coverity

[Tom Rini]

On Sun, Aug 20, 2017 at 08:05:40PM -0400, Tom Rini wrote:

> As part of fixing the previously reported issues, it was missed that in
> the case of mtdparts_init() we need to make sure that tmp_ep is long
> enough to contain PARTITION_MAXLEN and a NULL termination.  Then, to be
> sure the buffer is NULL terminated, zero the entire buffer rather than
> just ensuring the first character is NULL.
> 
> Cc: Lothar Waßmann <LW at KARO-electronics.de>
> Cc: Maxime Ripard <maxime.ripard at free-electrons.com>
> Reported-by: Coverity (CID: 166329)
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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