[NETLINK] Check netlink_insert in kernel_create

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi:

This patch checks the return value of netlink_insert() in
netlink_kernel_create().  It could fail if someone loads
the same module twice for instance.

Signed-off-by: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx> 

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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