[U-Boot] mtdparts: Fix various issues reported by Coverity

[Tom Rini]

On Mon, Aug 14, 2017 at 08:42:27PM -0400, Tom Rini wrote:

> Now that sandbox is building cmd/mtdparts.c Coverity has looked at the
> code and found a number of issues.  In index_partitions() it is possible
> that part will be NULL, so re-work the checks and debug statements to
> take this into account.  We have a number of string buffers that we
> print to in the exact size of, and use string functions on, so we need
> to ensure they are large enough to be NULL terminated.  In
> device_parse() it is not possible for num_partitions to be 0 (we would
> have hit a different error first) so remove logically dead code.
> Finally, in parse_mtdparts() if we have an error we need to free the
> memory allocated to dev.
> 
> Cc: Lothar Waßmann <LW at KARO-electronics.de>
> Cc: Maxime Ripard <maxime.ripard at free-electrons.com>
> Reported-by: Coverity (CID: 166334, 166333, 166332, 166329, 166328)
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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