[BUG] net/ipv4: inconsistent routing table

[Zang MingJie]

Hi:

I found a bug when remove an ip address which is referenced by a routing entry.

step to reproduce:

ip li add type dummy
ip li set dummy0 up
ip ad add 10.0.0.1/24 dev dummy0
ip ad add 10.0.0.2/24 dev dummy0
ip ro add default via 10.0.0.2/24
ip ad del 10.0.0.2/24 dev dummy0

after deleting the secondary ip address, the routing entry still
pointing to 10.0.0.2

# ip ro
default via 10.0.0.2 dev dummy0
10.0.0.0/24 dev dummy0  proto kernel  scope link  src 10.0.0.1

but actually, kernel considers the default route is directly connected.

# ip ro get 1.1.1.1
1.1.1.1 dev dummy0  src 10.0.0.1
    cache
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