[PATCH] test-skeleton.c (xrealloc): Support realloc-as-free

[Mike Frysinger]

On 23 Jun 2016 14:23, Florian Weimer wrote:
> If the requested size is zero, realloc returns NULL, but the
> deallocation is still successful.

not exactly.  realloc(NULL, 0) will return a valid pointer (much
like malloc(NULL) will).  code relies on this to generate cookies.
-mike
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