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Applications using L2TP/IP sockets want to be able to bind() an L2TP/IP socket to set the local tunnel id while leaving the auto-assigned source address alone. So if no source address is supplied, don't overwrite the address already stored in the socket. Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>