[IPV6] Fix dst leak in ipv6_add_addr

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi:

Found another error-path dst leak.  If the idev->dead check is
triggered in ipv6_add_addr the rt entry will leak.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> 

Cheers,
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
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