it looks that there are many places in libraries (src/lib), even
	in libc, where memory leak will happen on realloc failure.

	with this call:
		void *new, *orig;
		size_t newsize;
		new = realloc(orig, newsize);
	- when the reallocation succeeds, orig becomes invalid.
	- when the reallocation fails, new becomes NULL and orig will be
	  **retained**.  realloc does not free it.

	so, the following call leaks memory whenever realloc fails:
		p = realloc(p, newsize);
	you can no longer reference original region, while it was not freed.

	i think we should try go through every code in tree.

	openbsd realloc(3) manpage says it loudly, which is i think great.

itojun