IPv6: Removing unnecessary NULL checks patch causes crash.

I left my box to run some test scripts last night with net-next tree where patch
IPv6: Removing unnecessary NULL checks was applied. Crash had occurred when script 
executed "ip route change xxx/128 dev eth0" with non existing target twice 
in a row. (non existing target == there was no previous route to be changed) 

This was not occuring with kernel where only 
IPv6 routing, NLM_F_* flag support: REPLACE and EXCL flags support, warn about missing CREATE flag
and
IPv6 routing, NLM_F_* flag support: warn if new route is created without NLM_F_CREATE
were applied. 

Anyways, I cannot think how info struct could be NULL, so I am a bit
puzzled. Looks like I am missing some piece here. Anyways, somewhere in
these patches is lurking a bug. I try to find the reason. 

Sorry for the trouble.

--Matti

-- 
Matti Vaittinen
+358 504863070
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Told a UDP joke the other night...
...but I'm not sure everyone got it...
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