[ccan] [patch] str: update example to match code

[Rusty Russell]

On Sun, 16 Jan 2011 05:26:01 pm Brad Hards wrote:
> Please review and apply.
> 
> Brad

Thanks, applied.  I also wrote a new ccanlint test to check:

rusty at vivaldi:~/devel/cvs/ccan/ccan/str$ ../../tools/ccanlint/ccanlint
Example: sections demonstrate appropriate function (examples_relevant): FAIL
/home/rusty/devel/cvs/ccan/ccan/str/str.h:64:Example for strcount doesn't mention it
Total score: 37/38

Cheers,
Rusty.