xentop segfault -- xenstat_domain_name returning a null pointer?

[Charles Duffy <cduffy@spamcop.net>]

# xm list
Name                              ID Mem(MiB) VCPUs State  Time(s)
Domain-0                           0      512     1 r-----    41.8
demo-1                             1     1024     1 -b----    23.5
demo-2                             2     1024     1 -b----    23.1
demo-db                            3     2048     1 -b----    18.3
demo-vnc                           4      768     1 -b----     8.2
# gdb ./xentop
...
(gdb) run
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 16384 (LWP 9196)]
0x00002aaaaae9253f in strcasecmp () from /lib/libc.so.6
(gdb) bt
#0  0x00002aaaaae9253f in strcasecmp () from /lib/libc.so.6
#1  0x0000000000401f51 in compare_name (domain1=0x5248d0, domain2=0x524920)
     at xentop.c:351
#2  0x0000000000401f1e in compare_domains (domain1=0x524a70, 
domain2=0x524a78)
     at xentop.c:343
#3  0x00002aaaaae541ed in bsearch () from /lib/libc.so.6
#4  0x00002aaaaae540e4 in bsearch () from /lib/libc.so.6
#5  0x00002aaaaae543c9 in qsort () from /lib/libc.so.6
#6  0x00000000004030aa in top () at xentop.c:788
#7  0x0000000000403346 in main (argc=1, argv=0x7fffffe4dd38) at xentop.c:873
(gdb) up
#1  0x0000000000401f51 in compare_name (domain1=0x5248d0, domain2=0x524920)
     at xentop.c:351
351             return strcasecmp(xenstat_domain_name(domain1), 
xenstat_domain_name(domain2));
(gdb) print xenstat_domain_name(domain1)
$5 = 0
(gdb) print xenstat_domain_name(domain2)
$6 = 5393056
(gdb) print (char*)xenstat_domain_name(domain2)
$7 = 0x524aa0 "demo-1"