[U-Boot] cmd_md5sum.c: remove dead code / fix warning

[Tom Rini]

On Mon, Jun 16, 2014 at 12:10:42AM +0200, Jeroen Hofstee wrote:

> commit ecd729500 "Add parameter to md5sum to save the md5 sum"
> adds support to build a string to be saved in the env and tries
> to zero end it with str_ptr = '\0'; This does actually set the
> pointer to the end of the buffer itself to zero. Since the
> string was already zero terminated by the sprintf before it,
> just remove the line, preventing a clang warning.
> 
> cc: Joe Hershberger <joe.hershberger at ni.com>
> Signed-off-by: Jeroen Hofstee <jeroen at myspectrum.nl>

Applied to u-boot/master, thanks!

-- 
Tom
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