[PATCH] add support for -Wmismatched-dealloc

[Florian Weimer]

* Martin Sebor:

> Florian asked this morning if getaddrinfo() and freeaddrinfo() are
> covered by this change.  They're not because getaddrinfo() returns
> the allocated memory indirectly, via an argument.  To handle those
> kinds of APIs that return a pointer to the allocated object
> indirectly, through an argument, the attribute will need to be
> enhanced somehow.

asprintf is another such function, perhaps slightly more commonly used.
It would be nice if this interface pattern could be covered as well.

Thanks,
Florian
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