[U-Boot] common: hash: zero end the string instead of the pointer

[Tom Rini]

On Mon, Jun 09, 2014 at 11:02:02AM +0200, Jeroen Hofstee wrote:

> if algo->digest_size is zero nothing is set in the str_output
> buffer. An attempt is made to zero end the buffer, but the
> pointer to the buffer is set to zero instead. I am unaware if
> it causes any actual problems, but solves the following warning:
> 
> common/hash.c:217:13: warning: expression which evaluates to zero treated as
> a null pointer constant of type 'char *' [-Wnon-literal-null-conversion]
>                 str_ptr = '\0';
>                           ^~~~
> 
> cc: Simon Glass <sjg at chromium.org>
> Signed-off-by: Jeroen Hofstee <jeroen at myspectrum.nl>

Applied to u-boot/master, thanks!

-- 
Tom
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