[NETLINK]: Do precise netlink message allocations where possible
Thomas Graf authored

Account for the netlink message header size directly in nlmsg_new()
instead of relying on the caller calculate it correctly.

Replaces error handling of message construction functions when
constructing notifications with bug traps since a failure implies
a bug in calculating the size of the skb.
Signed-off-by: default avatarThomas Graf <tgraf@suug.ch>
Acked-by: default avatarPaul Moore <paul.moore@hp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
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