[BusyBox] fix sh memory leak

[Matt Kraai]

> On Tue Dec 12, 2000 at 05:17:37PM -0800, Matt Kraai wrote:
> > Rather than setting the buffer to the empty string before each
> > call (and forgetting some, like my patch for sh.c :), why not just
> > drop it into my_getpwuid and my_getgrgid and be done with it?
> > A patch is attached (which also moves a bunch of buffers from the
> > stack to the heap and fixes bugs in logname and whoami).

Whoops.  I meant it moves buffers from the heap to the stack.  Talk in
correct order I do.

Matt
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