[IPV6] address: Support NLM_F_EXCL when adding addresses
iproute2 doesn't provide the NLM_F_CREATE flag when adding addresses, it is assumed to be implied. The existing code issues a check on said flag when the modify operation fails (likely due to ENOENT) before continueing to create it, this leads to a hard to predict result, therefore the NLM_F_CREATE check is removed. Signed-off-by: NThomas Graf <tgraf@suug.ch> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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