another crash in CURRENT

[Olaf Titz]

...for each "ctlinnd cancel." Rather reproducible; this problem is at
least a week old.

Olaf

(gdb) bt
#0  0x401a5bdf in vfprintf () from /lib/libc.so.6
#1  0x401abd3d in fprintf () from /lib/libc.so.6
#2  0x804df4f in ARTlog (data=0xbfffb878, code=99 'c',
    text=0xbfffb73c "Cancelling <motif-faq/part2_980683306 at rtfm.mit.edu>")
    at art.c:314
#3  0x804f95b in ARTcancel (data=0xbfffb878,
    MessageID=0xbfffdb16 "<motif-faq/part2_980683306 at rtfm.mit.edu>", Trusted=1)
    at art.c:1211
#4  0x80530b9 in CCcancel (av=0xbfffbadc) at cc.c:462
#5  0x8055346 in CCreader (cp=0x40372280) at cc.c:1868
#6  0x80570d9 in CHANreadloop () at chan.c:1023
#7  0x805a2a4 in main (ac=4, av=0xbffffe84) at innd.c:637
(gdb)