lguest: fix ugly <NULL> in /proc/interrupts
Before:
root@ubuntu:~# cat /proc/interrupts
CPU0
1: 1672 lguest-<NULL> virtio0
2: 1 lguest-<NULL> virtio1
...
After:
root@ubuntu:~# cat /proc/interrupts
CPU0
1: 2889 lguest-level virtio0
2: 9 lguest-level virtio1
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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