[PATCH] size reduction who.c

[Tito]

Hi, 
this patch reduces size of who.c and cleans up the code.
Size reduction is:

  text    data     bss     dec     hex filename
    588       0       0     588     24c who.o.orig
    521       0       0     521     209 who.o

The patch is big because it fixes also the coding style.

Please apply.

Ciao,
Tito
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