PATCH: malloc.c cleanups

[Ulrich Drepper]

Greg McGary <greg@mcgary.org> writes:

> #define next_bin(b)    ((mbinptr)((char*)(b) + 2 * sizeof(main_arena.av[0])))
> #define prev_bin(b)    ((mbinptr)((char*)(b) - 2 * sizeof(main_arena.av[0])))
> 
> BTW, who has approval authority for malloc.c changes?
> You only?  Uli only?  Both of you?

Wolfram has to maintain the code so I'll listen if he says something
is wrong.  The change looks fine so if Wolfram wants to apply I have
no objections.

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