WARNING: attempt to net_add_domain(netgraph) after domainfinalize()

[Jiawei Ye]

Warnings started to appear after modifications to uipc_domain.c. The
warning used to appear after acpi_cpu in dmesg. Now it happens after
user_ppp is run (which I assume is why the netgraph related message
appeared) with latest uipc_domain.c commit.

Jiawei

-- 
"Without the userland, the kernel is useless."
               --inspired by The Tao of Programming