diag: warn about missing first netlink attribute
The first netlink attribute (value 0) must always be defined as none/unspec. This is correctly done in inet_diag.h, but other diag interfaces are wrong. Because we cannot change an existing API, I add a comment to point the mistake and avoid to propagate it in a new diag API in the future. CC: Thomas Graf <tgraf@suug.ch> Signed-off-by: NNicolas Dichtel <nicolas.dichtel@6wind.com> Acked-by: NThomas Graf <tgraf@suug.ch> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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