Tiny error in finger.c - (nf)

[utzoo!decvax!pur-ee!uiucdcs!kolstad]

#N:uiucdcs:8200001:000:246
uiucdcs!kolstad    Jun 24 22:07:00 1982

finger will blow off if someone has an inordinately long information field
without commas (e.g., :michael_petrea_isr_717_3324445:).  This is because
buff in routine matchcmp is allocated only 20 bytes.  40 is a big improvement:

	char buff[40];