[Picolibc] Patch for nano-malloc typos

[Keith Packard]

Andreas Innerlohninger <andreas.innerlohninger at robart.cc> writes:

> Some typos prevented realloc and mallinfo to be linked in when built
> with nano-malloc.

Thanks much! I found the same errors in the regular malloc
implementation and fixed those too. Your patch also showed that
the declaration of sbrk was only made under #ifdef DEFINE_MALLOC, so I
moved that outside of that block.

-- 
-keith
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